diff --git a/payload_consumer/bzip_extent_writer_unittest.cc b/payload_consumer/bzip_extent_writer_unittest.cc
index 125e1e5..b587040 100644
--- a/payload_consumer/bzip_extent_writer_unittest.cc
+++ b/payload_consumer/bzip_extent_writer_unittest.cc
@@ -49,7 +49,7 @@
   void TearDown() override { fd_->Close(); }
 
   FileDescriptorPtr fd_;
-  test_utils::ScopedTempFile temp_file_{"BzipExtentWriterTest-file.XXXXXX"};
+  ScopedTempFile temp_file_{"BzipExtentWriterTest-file.XXXXXX"};
 };
 
 TEST_F(BzipExtentWriterTest, SimpleTest) {
diff --git a/payload_consumer/cached_file_descriptor_unittest.cc b/payload_consumer/cached_file_descriptor_unittest.cc
index d2965fc..b64420a 100644
--- a/payload_consumer/cached_file_descriptor_unittest.cc
+++ b/payload_consumer/cached_file_descriptor_unittest.cc
@@ -73,7 +73,7 @@
 
  protected:
   FileDescriptorPtr fd_{new EintrSafeFileDescriptor};
-  test_utils::ScopedTempFile temp_file_{"CachedFileDescriptor-file.XXXXXX"};
+  ScopedTempFile temp_file_{"CachedFileDescriptor-file.XXXXXX"};
   int value_{1};
   FileDescriptorPtr cfd_;
 };
diff --git a/payload_consumer/delta_performer.cc b/payload_consumer/delta_performer.cc
index e7ef8a3..a3989d6 100644
--- a/payload_consumer/delta_performer.cc
+++ b/payload_consumer/delta_performer.cc
@@ -277,15 +277,6 @@
 
 }  // namespace
 
-uint32_t DeltaPerformer::GetMinorVersion() const {
-  if (manifest_.has_minor_version()) {
-    return manifest_.minor_version();
-  }
-  return payload_->type == InstallPayloadType::kDelta
-             ? kMaxSupportedMinorPayloadVersion
-             : kFullPayloadMinorVersion;
-}
-
 bool DeltaPerformer::IsHeaderParsed() const {
   return metadata_size_ != 0;
 }
@@ -1091,13 +1082,6 @@
     }
   }
 
-  if (manifest_.has_old_rootfs_info() || manifest_.has_new_rootfs_info() ||
-      manifest_.has_old_kernel_info() || manifest_.has_new_kernel_info() ||
-      manifest_.install_operations_size() != 0 ||
-      manifest_.kernel_install_operations_size() != 0) {
-    LOG(ERROR) << "Manifest contains deprecated fields.";
-    return ErrorCode::kPayloadMismatchedType;
-  }
   ErrorCode error_code = CheckTimestampError();
   if (error_code != ErrorCode::kSuccess) {
     if (error_code == ErrorCode::kPayloadTimestampError) {
@@ -1294,6 +1278,13 @@
     return ErrorCode::kPayloadSizeMismatchError;
   }
 
+  // Verifies the payload hash.
+  TEST_AND_RETURN_VAL(ErrorCode::kDownloadPayloadVerificationError,
+                      !payload_hash_calculator_.raw_hash().empty());
+  TEST_AND_RETURN_VAL(
+      ErrorCode::kPayloadHashMismatchError,
+      payload_hash_calculator_.raw_hash() == update_check_response_hash);
+
   auto [payload_verifier, perform_verification] = CreatePayloadVerifier();
   if (!perform_verification) {
     LOG(WARNING) << "Not verifying signed delta payload -- missing public key.";
@@ -1304,13 +1295,6 @@
     return ErrorCode::kDownloadPayloadPubKeyVerificationError;
   }
 
-  // Verifies the payload hash.
-  TEST_AND_RETURN_VAL(ErrorCode::kDownloadPayloadVerificationError,
-                      !payload_hash_calculator_.raw_hash().empty());
-  TEST_AND_RETURN_VAL(
-      ErrorCode::kPayloadHashMismatchError,
-      payload_hash_calculator_.raw_hash() == update_check_response_hash);
-
   TEST_AND_RETURN_VAL(ErrorCode::kSignedDeltaPayloadExpectedError,
                       !signatures_message_data_.empty());
   brillo::Blob hash_data = signed_hash_calculator_.raw_hash();
diff --git a/payload_consumer/delta_performer.h b/payload_consumer/delta_performer.h
index 96bc849..4990bf8 100644
--- a/payload_consumer/delta_performer.h
+++ b/payload_consumer/delta_performer.h
@@ -170,9 +170,13 @@
   // Return true if header parsing is finished and no errors occurred.
   bool IsHeaderParsed() const;
 
-  // Returns the delta minor version. If this value is defined in the manifest,
-  // it returns that value, otherwise it returns the default value.
-  uint32_t GetMinorVersion() const;
+  // Compare |calculated_hash| with source hash in |operation|, return false and
+  // dump hash and set |error| if don't match.
+  // |source_fd| is the file descriptor of the source partition.
+  static bool ValidateSourceHash(const brillo::Blob& calculated_hash,
+                                 const InstallOperation& operation,
+                                 const FileDescriptorPtr source_fd,
+                                 ErrorCode* error);
 
   // Initialize partitions and allocate required space for an update with the
   // given |manifest|. |update_check_response_hash| is used to check if the
diff --git a/payload_consumer/delta_performer_integration_test.cc b/payload_consumer/delta_performer_integration_test.cc
index f2aeb03..74ddd27 100644
--- a/payload_consumer/delta_performer_integration_test.cc
+++ b/payload_consumer/delta_performer_integration_test.cc
@@ -52,7 +52,9 @@
 
 namespace chromeos_update_engine {
 
+using std::list;
 using std::string;
+using std::unique_ptr;
 using std::vector;
 using test_utils::GetBuildArtifactsPath;
 using test_utils::kRandomString;
@@ -76,22 +78,24 @@
 
 namespace {
 struct DeltaState {
-  string a_img;
-  string b_img;
-  string result_img;
+  unique_ptr<ScopedTempFile> a_img;
+  unique_ptr<ScopedTempFile> b_img;
+  unique_ptr<ScopedTempFile> result_img;
   size_t image_size;
 
-  string delta_path;
+  unique_ptr<ScopedTempFile> delta_file;
+  // The in-memory copy of delta file.
+  brillo::Blob delta;
   uint64_t metadata_size;
   uint32_t metadata_signature_size;
 
-  string old_kernel;
+  unique_ptr<ScopedTempFile> old_kernel;
   brillo::Blob old_kernel_data;
 
-  string new_kernel;
+  unique_ptr<ScopedTempFile> new_kernel;
   brillo::Blob new_kernel_data;
 
-  string result_kernel;
+  unique_ptr<ScopedTempFile> result_kernel;
   brillo::Blob result_kernel_data;
   size_t kernel_size;
 
@@ -99,9 +103,6 @@
   // the DeltaPerformer.
   InstallPlan install_plan;
 
-  // The in-memory copy of delta file.
-  brillo::Blob delta;
-
   // Mock and fake instances used by the delta performer.
   FakeBootControl fake_boot_control_;
   FakeHardware fake_hardware_;
@@ -155,7 +156,7 @@
     EXPECT_EQ(expected, performer.ValidateManifest());
   }
   void AddPartition(DeltaArchiveManifest* manifest,
-                    std::string name,
+                    string name,
                     int timestamp) {
     auto& partition = *manifest->add_partitions();
     partition.set_version(std::to_string(timestamp));
@@ -259,8 +260,7 @@
   }
   string signature_size_string = base::JoinString(signature_size_strings, ":");
 
-  test_utils::ScopedTempFile hash_file("hash.XXXXXX"),
-      metadata_hash_file("hash.XXXXXX");
+  ScopedTempFile hash_file("hash.XXXXXX"), metadata_hash_file("hash.XXXXXX");
   string delta_generator_path = GetBuildArtifactsPath("delta_generator");
   ASSERT_EQ(0,
             System(base::StringPrintf(
@@ -273,29 +273,27 @@
                 metadata_hash_file.path().c_str())));
 
   // Sign the hash with all private keys.
-  vector<test_utils::ScopedTempFile> sig_files, metadata_sig_files;
+  list<ScopedTempFile> sig_files, metadata_sig_files;
   vector<string> sig_file_paths, metadata_sig_file_paths;
   for (const auto& key_path : private_key_paths) {
     brillo::Blob hash, signature;
     ASSERT_TRUE(utils::ReadFile(hash_file.path(), &hash));
     ASSERT_TRUE(PayloadSigner::SignHash(hash, key_path, &signature));
 
-    test_utils::ScopedTempFile sig_file("signature.XXXXXX");
-    ASSERT_TRUE(test_utils::WriteFileVector(sig_file.path(), signature));
-    sig_file_paths.push_back(sig_file.path());
-    sig_files.push_back(std::move(sig_file));
+    sig_files.emplace_back("signature.XXXXXX");
+    ASSERT_TRUE(
+        test_utils::WriteFileVector(sig_files.back().path(), signature));
+    sig_file_paths.push_back(sig_files.back().path());
 
     brillo::Blob metadata_hash, metadata_signature;
     ASSERT_TRUE(utils::ReadFile(metadata_hash_file.path(), &metadata_hash));
     ASSERT_TRUE(
         PayloadSigner::SignHash(metadata_hash, key_path, &metadata_signature));
 
-    test_utils::ScopedTempFile metadata_sig_file("signature.XXXXXX");
-    ASSERT_TRUE(test_utils::WriteFileVector(metadata_sig_file.path(),
+    metadata_sig_files.emplace_back("metadata_signature.XXXXXX");
+    ASSERT_TRUE(test_utils::WriteFileVector(metadata_sig_files.back().path(),
                                             metadata_signature));
-
-    metadata_sig_file_paths.push_back(metadata_sig_file.path());
-    metadata_sig_files.push_back(std::move(metadata_sig_file));
+    metadata_sig_file_paths.push_back(metadata_sig_files.back().path());
   }
   string sig_files_string = base::JoinString(sig_file_paths, ":");
   string metadata_sig_files_string =
@@ -377,7 +375,7 @@
         GetBuildArtifactsPath(kUnittestPrivateKey2Path));
   }
 
-  std::string public_key;
+  string public_key;
   if (signature_test == kSignatureGeneratedShellRotateCl2) {
     public_key = GetBuildArtifactsPath(kUnittestPublicKey2Path);
   } else if (signature_test == kSignatureGeneratedShellECKey) {
@@ -397,44 +395,23 @@
                               SignatureTest signature_test,
                               DeltaState* state,
                               uint32_t minor_version) {
-  EXPECT_TRUE(utils::MakeTempFile("a_img.XXXXXX", &state->a_img, nullptr));
-  EXPECT_TRUE(utils::MakeTempFile("b_img.XXXXXX", &state->b_img, nullptr));
+  state->a_img.reset(new ScopedTempFile("a_img.XXXXXX"));
+  state->b_img.reset(new ScopedTempFile("b_img.XXXXXX"));
 
   // result_img is used in minor version 2. Instead of applying the update
   // in-place on A, we apply it to a new image, result_img.
-  EXPECT_TRUE(
-      utils::MakeTempFile("result_img.XXXXXX", &state->result_img, nullptr));
+  state->result_img.reset(new ScopedTempFile("result_img.XXXXXX"));
 
   EXPECT_TRUE(
       base::CopyFile(GetBuildArtifactsPath().Append("gen/disk_ext2_4k.img"),
-                     base::FilePath(state->a_img)));
+                     base::FilePath(state->a_img->path())));
 
-  state->image_size = utils::FileSize(state->a_img);
-
-  // Create ImageInfo A & B
-  ImageInfo old_image_info;
-  ImageInfo new_image_info;
-
-  if (!full_rootfs) {
-    old_image_info.set_channel("src-channel");
-    old_image_info.set_board("src-board");
-    old_image_info.set_version("src-version");
-    old_image_info.set_key("src-key");
-    old_image_info.set_build_channel("src-build-channel");
-    old_image_info.set_build_version("src-build-version");
-  }
-
-  new_image_info.set_channel("test-channel");
-  new_image_info.set_board("test-board");
-  new_image_info.set_version("test-version");
-  new_image_info.set_key("test-key");
-  new_image_info.set_build_channel("test-build-channel");
-  new_image_info.set_build_version("test-build-version");
+  state->image_size = utils::FileSize(state->a_img->path());
 
   // Make some changes to the A image.
   {
     string a_mnt;
-    ScopedLoopMounter b_mounter(state->a_img, &a_mnt, 0);
+    ScopedLoopMounter b_mounter(state->a_img->path(), &a_mnt, 0);
 
     brillo::Blob hardtocompress;
     while (hardtocompress.size() < 3 * kBlockSize) {
@@ -471,17 +448,18 @@
 
   // Create a result image with image_size bytes of garbage.
   brillo::Blob ones(state->image_size, 0xff);
-  EXPECT_TRUE(
-      utils::WriteFile(state->result_img.c_str(), ones.data(), ones.size()));
-  EXPECT_EQ(utils::FileSize(state->a_img), utils::FileSize(state->result_img));
+  EXPECT_TRUE(utils::WriteFile(
+      state->result_img->path().c_str(), ones.data(), ones.size()));
+  EXPECT_EQ(utils::FileSize(state->a_img->path()),
+            utils::FileSize(state->result_img->path()));
 
   EXPECT_TRUE(
       base::CopyFile(GetBuildArtifactsPath().Append("gen/disk_ext2_4k.img"),
-                     base::FilePath(state->b_img)));
+                     base::FilePath(state->b_img->path())));
   {
     // Make some changes to the B image.
     string b_mnt;
-    ScopedLoopMounter b_mounter(state->b_img, &b_mnt, 0);
+    ScopedLoopMounter b_mounter(state->b_img->path(), &b_mnt, 0);
     base::FilePath mnt_path(b_mnt);
 
     EXPECT_TRUE(base::CopyFile(mnt_path.Append("regular-small"),
@@ -529,18 +507,9 @@
         hardtocompress.size()));
   }
 
-  string old_kernel;
-  EXPECT_TRUE(
-      utils::MakeTempFile("old_kernel.XXXXXX", &state->old_kernel, nullptr));
-
-  string new_kernel;
-  EXPECT_TRUE(
-      utils::MakeTempFile("new_kernel.XXXXXX", &state->new_kernel, nullptr));
-
-  string result_kernel;
-  EXPECT_TRUE(utils::MakeTempFile(
-      "result_kernel.XXXXXX", &state->result_kernel, nullptr));
-
+  state->old_kernel.reset(new ScopedTempFile("old_kernel.XXXXXX"));
+  state->new_kernel.reset(new ScopedTempFile("new_kernel.XXXXXX"));
+  state->result_kernel.reset(new ScopedTempFile("result_kernel.XXXXXX"));
   state->kernel_size = kDefaultKernelSize;
   state->old_kernel_data.resize(kDefaultKernelSize);
   state->new_kernel_data.resize(state->old_kernel_data.size());
@@ -554,18 +523,17 @@
       std::begin(kNewData), std::end(kNewData), state->new_kernel_data.begin());
 
   // Write kernels to disk
-  EXPECT_TRUE(utils::WriteFile(state->old_kernel.c_str(),
+  EXPECT_TRUE(utils::WriteFile(state->old_kernel->path().c_str(),
                                state->old_kernel_data.data(),
                                state->old_kernel_data.size()));
-  EXPECT_TRUE(utils::WriteFile(state->new_kernel.c_str(),
+  EXPECT_TRUE(utils::WriteFile(state->new_kernel->path().c_str(),
                                state->new_kernel_data.data(),
                                state->new_kernel_data.size()));
-  EXPECT_TRUE(utils::WriteFile(state->result_kernel.c_str(),
+  EXPECT_TRUE(utils::WriteFile(state->result_kernel->path().c_str(),
                                state->result_kernel_data.data(),
                                state->result_kernel_data.size()));
 
-  EXPECT_TRUE(utils::MakeTempFile("delta.XXXXXX", &state->delta_path, nullptr));
-  LOG(INFO) << "delta path: " << state->delta_path;
+  state->delta_file.reset(new ScopedTempFile("delta.XXXXXX"));
   {
     const string private_key =
         signature_test == kSignatureGenerator
@@ -581,10 +549,10 @@
     if (!full_rootfs) {
       payload_config.source.partitions.emplace_back(kPartitionNameRoot);
       payload_config.source.partitions.emplace_back(kPartitionNameKernel);
-      payload_config.source.partitions.front().path = state->a_img;
+      payload_config.source.partitions.front().path = state->a_img->path();
       if (!full_kernel)
-        payload_config.source.partitions.back().path = state->old_kernel;
-      payload_config.source.image_info = old_image_info;
+        payload_config.source.partitions.back().path =
+            state->old_kernel->path();
       EXPECT_TRUE(payload_config.source.LoadImageSize());
       for (PartitionConfig& part : payload_config.source.partitions)
         EXPECT_TRUE(part.OpenFilesystem());
@@ -594,29 +562,30 @@
         payload_config.hard_chunk_size = 1024 * 1024;
     }
     payload_config.target.partitions.emplace_back(kPartitionNameRoot);
-    payload_config.target.partitions.back().path = state->b_img;
+    payload_config.target.partitions.back().path = state->b_img->path();
     payload_config.target.partitions.emplace_back(kPartitionNameKernel);
-    payload_config.target.partitions.back().path = state->new_kernel;
-    payload_config.target.image_info = new_image_info;
+    payload_config.target.partitions.back().path = state->new_kernel->path();
     EXPECT_TRUE(payload_config.target.LoadImageSize());
     for (PartitionConfig& part : payload_config.target.partitions)
       EXPECT_TRUE(part.OpenFilesystem());
 
     EXPECT_TRUE(payload_config.Validate());
-    EXPECT_TRUE(GenerateUpdatePayloadFile(
-        payload_config, state->delta_path, private_key, &state->metadata_size));
+    EXPECT_TRUE(GenerateUpdatePayloadFile(payload_config,
+                                          state->delta_file->path(),
+                                          private_key,
+                                          &state->metadata_size));
   }
   // Extend the "partitions" holding the file system a bit.
   EXPECT_EQ(0,
-            HANDLE_EINTR(truncate(state->a_img.c_str(),
+            HANDLE_EINTR(truncate(state->a_img->path().c_str(),
                                   state->image_size + 1024 * 1024)));
   EXPECT_EQ(static_cast<off_t>(state->image_size + 1024 * 1024),
-            utils::FileSize(state->a_img));
+            utils::FileSize(state->a_img->path()));
   EXPECT_EQ(0,
-            HANDLE_EINTR(truncate(state->b_img.c_str(),
+            HANDLE_EINTR(truncate(state->b_img->path().c_str(),
                                   state->image_size + 1024 * 1024)));
   EXPECT_EQ(static_cast<off_t>(state->image_size + 1024 * 1024),
-            utils::FileSize(state->b_img));
+            utils::FileSize(state->b_img->path()));
 
   if (signature_test == kSignatureGeneratedPlaceholder ||
       signature_test == kSignatureGeneratedPlaceholderMismatch) {
@@ -625,13 +594,13 @@
         GetBuildArtifactsPath(kUnittestPrivateKeyPath), &signature_size));
     LOG(INFO) << "Inserting placeholder signature.";
     ASSERT_TRUE(InsertSignaturePlaceholder(
-        signature_size, state->delta_path, &state->metadata_size));
+        signature_size, state->delta_file->path(), &state->metadata_size));
 
     if (signature_test == kSignatureGeneratedPlaceholderMismatch) {
       signature_size -= 1;
       LOG(INFO) << "Inserting mismatched placeholder signature.";
       ASSERT_FALSE(InsertSignaturePlaceholder(
-          signature_size, state->delta_path, &state->metadata_size));
+          signature_size, state->delta_file->path(), &state->metadata_size));
       return;
     }
   }
@@ -643,13 +612,13 @@
     // reflect the new size after adding the signature operation to the
     // manifest.
     LOG(INFO) << "Signing payload.";
-    SignGeneratedPayload(state->delta_path, &state->metadata_size);
+    SignGeneratedPayload(state->delta_file->path(), &state->metadata_size);
   } else if (signature_test == kSignatureGeneratedShell ||
              signature_test == kSignatureGeneratedShellECKey ||
              signature_test == kSignatureGeneratedShellBadKey ||
              signature_test == kSignatureGeneratedShellRotateCl1 ||
              signature_test == kSignatureGeneratedShellRotateCl2) {
-    SignGeneratedShellPayload(signature_test, state->delta_path);
+    SignGeneratedShellPayload(signature_test, state->delta_file->path());
   }
 }
 
@@ -663,7 +632,7 @@
                            uint32_t minor_version) {
   // Check the metadata.
   {
-    EXPECT_TRUE(utils::ReadFile(state->delta_path, &state->delta));
+    EXPECT_TRUE(utils::ReadFile(state->delta_file->path(), &state->delta));
     PayloadMetadata payload_metadata;
     EXPECT_TRUE(payload_metadata.ParsePayloadHeader(state->delta));
     state->metadata_size = payload_metadata.GetMetadataSize();
@@ -738,22 +707,6 @@
       EXPECT_FALSE(rootfs_part.old_partition_info().hash().empty());
     }
     EXPECT_FALSE(rootfs_part.new_partition_info().hash().empty());
-
-    EXPECT_EQ(manifest.new_image_info().channel(), "test-channel");
-    EXPECT_EQ(manifest.new_image_info().board(), "test-board");
-    EXPECT_EQ(manifest.new_image_info().version(), "test-version");
-    EXPECT_EQ(manifest.new_image_info().key(), "test-key");
-    EXPECT_EQ(manifest.new_image_info().build_channel(), "test-build-channel");
-    EXPECT_EQ(manifest.new_image_info().build_version(), "test-build-version");
-
-    if (!full_rootfs) {
-      EXPECT_EQ(manifest.old_image_info().channel(), "src-channel");
-      EXPECT_EQ(manifest.old_image_info().board(), "src-board");
-      EXPECT_EQ(manifest.old_image_info().version(), "src-version");
-      EXPECT_EQ(manifest.old_image_info().key(), "src-key");
-      EXPECT_EQ(manifest.old_image_info().build_channel(), "src-build-channel");
-      EXPECT_EQ(manifest.old_image_info().build_version(), "src-build-version");
-    }
   }
 
   MockPrefs prefs;
@@ -832,9 +785,10 @@
   (*performer)->set_public_key_path(public_key_path);
   (*performer)->set_update_certificates_path("");
 
-  EXPECT_EQ(static_cast<off_t>(state->image_size),
-            HashCalculator::RawHashOfFile(
-                state->a_img, state->image_size, &root_part.source_hash));
+  EXPECT_EQ(
+      static_cast<off_t>(state->image_size),
+      HashCalculator::RawHashOfFile(
+          state->a_img->path(), state->image_size, &root_part.source_hash));
   EXPECT_TRUE(HashCalculator::RawHashOfData(state->old_kernel_data,
                                             &kernel_part.source_hash));
 
@@ -842,13 +796,15 @@
   install_plan->partitions.clear();
 
   state->fake_boot_control_.SetPartitionDevice(
-      kPartitionNameRoot, install_plan->source_slot, state->a_img);
+      kPartitionNameRoot, install_plan->source_slot, state->a_img->path());
+  state->fake_boot_control_.SetPartitionDevice(kPartitionNameKernel,
+                                               install_plan->source_slot,
+                                               state->old_kernel->path());
   state->fake_boot_control_.SetPartitionDevice(
-      kPartitionNameKernel, install_plan->source_slot, state->old_kernel);
-  state->fake_boot_control_.SetPartitionDevice(
-      kPartitionNameRoot, install_plan->target_slot, state->result_img);
-  state->fake_boot_control_.SetPartitionDevice(
-      kPartitionNameKernel, install_plan->target_slot, state->result_kernel);
+      kPartitionNameRoot, install_plan->target_slot, state->result_img->path());
+  state->fake_boot_control_.SetPartitionDevice(kPartitionNameKernel,
+                                               install_plan->target_slot,
+                                               state->result_kernel->path());
 
   ErrorCode expected_error, actual_error;
   bool continue_writing;
@@ -927,12 +883,15 @@
     return;
   }
 
+  CompareFilesByBlock(state->result_kernel->path(),
+                      state->new_kernel->path(),
+                      state->kernel_size);
   CompareFilesByBlock(
-      state->result_kernel, state->new_kernel, state->kernel_size);
-  CompareFilesByBlock(state->result_img, state->b_img, state->image_size);
+      state->result_img->path(), state->b_img->path(), state->image_size);
 
   brillo::Blob updated_kernel_partition;
-  EXPECT_TRUE(utils::ReadFile(state->result_kernel, &updated_kernel_partition));
+  EXPECT_TRUE(
+      utils::ReadFile(state->result_kernel->path(), &updated_kernel_partition));
   ASSERT_GE(updated_kernel_partition.size(), base::size(kNewData));
   EXPECT_TRUE(std::equal(std::begin(kNewData),
                          std::end(kNewData),
@@ -951,9 +910,10 @@
 
   EXPECT_EQ(state->image_size, partitions[0].target_size);
   brillo::Blob expected_new_rootfs_hash;
-  EXPECT_EQ(static_cast<off_t>(state->image_size),
-            HashCalculator::RawHashOfFile(
-                state->b_img, state->image_size, &expected_new_rootfs_hash));
+  EXPECT_EQ(
+      static_cast<off_t>(state->image_size),
+      HashCalculator::RawHashOfFile(
+          state->b_img->path(), state->image_size, &expected_new_rootfs_hash));
   EXPECT_EQ(expected_new_rootfs_hash, partitions[0].target_hash);
 }
 
@@ -991,13 +951,6 @@
                     &state,
                     minor_version);
 
-  ScopedPathUnlinker a_img_unlinker(state.a_img);
-  ScopedPathUnlinker b_img_unlinker(state.b_img);
-  ScopedPathUnlinker new_img_unlinker(state.result_img);
-  ScopedPathUnlinker delta_unlinker(state.delta_path);
-  ScopedPathUnlinker old_kernel_unlinker(state.old_kernel);
-  ScopedPathUnlinker new_kernel_unlinker(state.new_kernel);
-  ScopedPathUnlinker result_kernel_unlinker(state.result_kernel);
   ApplyDeltaFile(full_kernel,
                  full_rootfs,
                  signature_test,
@@ -1015,11 +968,6 @@
   DeltaState state;
   uint64_t minor_version = kFullPayloadMinorVersion;
   GenerateDeltaFile(true, true, -1, kSignatureGenerated, &state, minor_version);
-  ScopedPathUnlinker a_img_unlinker(state.a_img);
-  ScopedPathUnlinker b_img_unlinker(state.b_img);
-  ScopedPathUnlinker delta_unlinker(state.delta_path);
-  ScopedPathUnlinker old_kernel_unlinker(state.old_kernel);
-  ScopedPathUnlinker new_kernel_unlinker(state.new_kernel);
   DeltaPerformer* performer = nullptr;
   ApplyDeltaFile(true,
                  true,
diff --git a/payload_consumer/delta_performer_unittest.cc b/payload_consumer/delta_performer_unittest.cc
index a5eb538..f742b1c 100644
--- a/payload_consumer/delta_performer_unittest.cc
+++ b/payload_consumer/delta_performer_unittest.cc
@@ -202,7 +202,7 @@
                                uint64_t major_version,
                                uint32_t minor_version,
                                PartitionConfig* old_part = nullptr) {
-    test_utils::ScopedTempFile blob_file("Blob-XXXXXX");
+    ScopedTempFile blob_file("Blob-XXXXXX");
     EXPECT_TRUE(test_utils::WriteFileVector(blob_file.path(), blob_data));
 
     PayloadGenerationConfig config;
@@ -236,7 +236,7 @@
     new_part.size = 0;
     payload.AddPartition(*old_part, new_part, {}, {});
 
-    test_utils::ScopedTempFile payload_file("Payload-XXXXXX");
+    ScopedTempFile payload_file("Payload-XXXXXX");
     string private_key =
         sign_payload ? GetBuildArtifactsPath(kUnittestPrivateKeyPath) : "";
     EXPECT_TRUE(payload.WritePayload(payload_file.path(),
@@ -287,7 +287,7 @@
                                   const string& source_path,
                                   const brillo::Blob& target_data,
                                   bool expect_success) {
-    test_utils::ScopedTempFile new_part("Partition-XXXXXX");
+    ScopedTempFile new_part("Partition-XXXXXX");
     EXPECT_TRUE(test_utils::WriteFileVector(new_part.path(), target_data));
 
     payload_.size = payload_data.size();
@@ -576,7 +576,7 @@
   EXPECT_TRUE(HashCalculator::RawHashOfData(expected_data, &src_hash));
   aop.op.set_src_sha256_hash(src_hash.data(), src_hash.size());
 
-  test_utils::ScopedTempFile source("Source-XXXXXX");
+  ScopedTempFile source("Source-XXXXXX");
   EXPECT_TRUE(test_utils::WriteFileVector(source.path(), expected_data));
 
   PartitionConfig old_part(kPartitionNameRoot);
@@ -604,7 +604,7 @@
   EXPECT_TRUE(HashCalculator::RawHashOfData(src, &src_hash));
   aop.op.set_src_sha256_hash(src_hash.data(), src_hash.size());
 
-  test_utils::ScopedTempFile source("Source-XXXXXX");
+  ScopedTempFile source("Source-XXXXXX");
   EXPECT_TRUE(test_utils::WriteFileVector(source.path(), src));
 
   PartitionConfig old_part(kPartitionNameRoot);
@@ -632,7 +632,7 @@
   EXPECT_TRUE(HashCalculator::RawHashOfData(expected_data, &src_hash));
   aop.op.set_src_sha256_hash(src_hash.data(), src_hash.size());
 
-  test_utils::ScopedTempFile source("Source-XXXXXX");
+  ScopedTempFile source("Source-XXXXXX");
   EXPECT_TRUE(test_utils::WriteFileVector(source.path(), actual_data));
 
   PartitionConfig old_part(kPartitionNameRoot);
@@ -645,9 +645,6 @@
   EXPECT_EQ(actual_data, ApplyPayload(payload_data, source.path(), false));
 }
 
-
-
-
 TEST_F(DeltaPerformerTest, ExtentsToByteStringTest) {
   uint64_t test[] = {1, 1, 4, 2, 0, 1};
   static_assert(base::size(test) % 2 == 0, "Array size uneven");
diff --git a/payload_consumer/download_action_unittest.cc b/payload_consumer/download_action_unittest.cc
index e6ca219..9daa791 100644
--- a/payload_consumer/download_action_unittest.cc
+++ b/payload_consumer/download_action_unittest.cc
@@ -51,7 +51,6 @@
 using base::WriteFile;
 using std::string;
 using std::unique_ptr;
-using test_utils::ScopedTempFile;
 using testing::_;
 using testing::AtLeast;
 using testing::InSequence;
@@ -133,7 +132,6 @@
   loop.SetAsCurrent();
   FakeSystemState fake_system_state;
 
-  // TODO(adlr): see if we need a different file for build bots
   ScopedTempFile output_temp_file;
   TestDirectFileWriter writer;
   EXPECT_EQ(
diff --git a/payload_consumer/extent_reader_unittest.cc b/payload_consumer/extent_reader_unittest.cc
index b7059bc..686f14d 100644
--- a/payload_consumer/extent_reader_unittest.cc
+++ b/payload_consumer/extent_reader_unittest.cc
@@ -72,7 +72,7 @@
   }
 
   FileDescriptorPtr fd_;
-  test_utils::ScopedTempFile temp_file_{"ExtentReaderTest-file.XXXXXX"};
+  ScopedTempFile temp_file_{"ExtentReaderTest-file.XXXXXX"};
   brillo::Blob sample_;
 };
 
diff --git a/payload_consumer/extent_writer_unittest.cc b/payload_consumer/extent_writer_unittest.cc
index aef856b..afebb1a 100644
--- a/payload_consumer/extent_writer_unittest.cc
+++ b/payload_consumer/extent_writer_unittest.cc
@@ -59,7 +59,7 @@
   void WriteAlignedExtents(size_t chunk_size, size_t first_chunk_size);
 
   FileDescriptorPtr fd_;
-  test_utils::ScopedTempFile temp_file_{"ExtentWriterTest-file.XXXXXX"};
+  ScopedTempFile temp_file_{"ExtentWriterTest-file.XXXXXX"};
 };
 
 TEST_F(ExtentWriterTest, SimpleTest) {
diff --git a/payload_consumer/file_descriptor_utils_unittest.cc b/payload_consumer/file_descriptor_utils_unittest.cc
index 48e610f..478893d 100644
--- a/payload_consumer/file_descriptor_utils_unittest.cc
+++ b/payload_consumer/file_descriptor_utils_unittest.cc
@@ -52,14 +52,13 @@
 class FileDescriptorUtilsTest : public ::testing::Test {
  protected:
   void SetUp() override {
-    EXPECT_TRUE(utils::MakeTempFile("fd_tgt.XXXXXX", &tgt_path_, nullptr));
-    EXPECT_TRUE(target_->Open(tgt_path_.c_str(), O_RDWR));
+    EXPECT_TRUE(target_->Open(tgt_file_.path().c_str(), O_RDWR));
   }
 
   // Check that the |target_| file contains |expected_contents|.
   void ExpectTarget(const std::string& expected_contents) {
     std::string target_contents;
-    EXPECT_TRUE(utils::ReadFile(tgt_path_, &target_contents));
+    EXPECT_TRUE(utils::ReadFile(tgt_file_.path(), &target_contents));
     EXPECT_EQ(expected_contents.size(), target_contents.size());
     if (target_contents != expected_contents) {
       ADD_FAILURE() << "Contents don't match.";
@@ -70,8 +69,7 @@
     }
   }
 
-  // Path to the target temporary file.
-  std::string tgt_path_;
+  ScopedTempFile tgt_file_{"fd_tgt.XXXXXX"};
 
   // Source and target file descriptor used for testing the tools.
   FakeFileDescriptor* fake_source_{new FakeFileDescriptor()};
diff --git a/payload_consumer/file_writer_unittest.cc b/payload_consumer/file_writer_unittest.cc
index 59cfe2b..3b959f3 100644
--- a/payload_consumer/file_writer_unittest.cc
+++ b/payload_consumer/file_writer_unittest.cc
@@ -35,8 +35,7 @@
 class FileWriterTest : public ::testing::Test {};
 
 TEST(FileWriterTest, SimpleTest) {
-  // Create a uniquely named file for testing.
-  test_utils::ScopedTempFile file("FileWriterTest-XXXXXX");
+  ScopedTempFile file("FileWriterTest-XXXXXX");
   DirectFileWriter file_writer;
   EXPECT_EQ(0,
             file_writer.Open(file.path().c_str(),
@@ -60,7 +59,7 @@
 
 TEST(FileWriterTest, WriteErrorTest) {
   // Create a uniquely named file for testing.
-  test_utils::ScopedTempFile file("FileWriterTest-XXXXXX");
+  ScopedTempFile file("FileWriterTest-XXXXXX");
   DirectFileWriter file_writer;
   EXPECT_EQ(0,
             file_writer.Open(file.path().c_str(),
diff --git a/payload_consumer/filesystem_verifier_action_unittest.cc b/payload_consumer/filesystem_verifier_action_unittest.cc
index 2971849..2c29b44 100644
--- a/payload_consumer/filesystem_verifier_action_unittest.cc
+++ b/payload_consumer/filesystem_verifier_action_unittest.cc
@@ -92,7 +92,7 @@
 
 bool FilesystemVerifierActionTest::DoTest(bool terminate_early,
                                           bool hash_fail) {
-  test_utils::ScopedTempFile a_loop_file("a_loop_file.XXXXXX");
+  ScopedTempFile a_loop_file("a_loop_file.XXXXXX");
 
   // Make random data for a.
   const size_t kLoopFileSize = 10 * 1024 * 1024 + 512;
@@ -278,7 +278,7 @@
 
 #ifdef __ANDROID__
 TEST_F(FilesystemVerifierActionTest, RunAsRootWriteVerityTest) {
-  test_utils::ScopedTempFile part_file("part_file.XXXXXX");
+  ScopedTempFile part_file("part_file.XXXXXX");
   constexpr size_t filesystem_size = 200 * 4096;
   constexpr size_t part_size = 256 * 4096;
   brillo::Blob part_data(filesystem_size, 0x1);
@@ -340,7 +340,7 @@
 #endif  // __ANDROID__
 
 TEST_F(FilesystemVerifierActionTest, RunAsRootSkipWriteVerityTest) {
-  test_utils::ScopedTempFile part_file("part_file.XXXXXX");
+  ScopedTempFile part_file("part_file.XXXXXX");
   constexpr size_t filesystem_size = 200 * 4096;
   constexpr size_t part_size = 256 * 4096;
   brillo::Blob part_data(part_size);
diff --git a/payload_consumer/install_plan.cc b/payload_consumer/install_plan.cc
index a313627..c7ef7b2 100644
--- a/payload_consumer/install_plan.cc
+++ b/payload_consumer/install_plan.cc
@@ -98,8 +98,8 @@
             << version_str
             << ", source_slot: " << BootControlInterface::SlotName(source_slot)
             << ", target_slot: " << BootControlInterface::SlotName(target_slot)
-            << ", initial url: " << url_str << payloads_str
-            << partitions_str << ", hash_checks_mandatory: "
+            << ", initial url: " << url_str << payloads_str << partitions_str
+            << ", hash_checks_mandatory: "
             << utils::ToString(hash_checks_mandatory)
             << ", powerwash_required: " << utils::ToString(powerwash_required)
             << ", switch_slot_on_reboot: "
diff --git a/payload_consumer/install_plan.h b/payload_consumer/install_plan.h
index f04c650..5534fb3 100644
--- a/payload_consumer/install_plan.h
+++ b/payload_consumer/install_plan.h
@@ -59,8 +59,8 @@
 
   struct Payload {
     std::vector<std::string> payload_urls;  // URLs to download the payload
-    uint64_t size = 0;               // size of the payload
-    uint64_t metadata_size = 0;      // size of the metadata
+    uint64_t size = 0;                      // size of the payload
+    uint64_t metadata_size = 0;             // size of the metadata
     std::string metadata_signature;  // signature of the metadata in base64
     brillo::Blob hash;               // SHA256 hash of the payload
     InstallPayloadType type{InstallPayloadType::kUnknown};
diff --git a/payload_consumer/partition_update_generator_android.cc b/payload_consumer/partition_update_generator_android.cc
index d5d5313..25771e1 100644
--- a/payload_consumer/partition_update_generator_android.cc
+++ b/payload_consumer/partition_update_generator_android.cc
@@ -32,10 +32,8 @@
 namespace chromeos_update_engine {
 
 PartitionUpdateGeneratorAndroid::PartitionUpdateGeneratorAndroid(
-    BootControlInterface* boot_control,
-    size_t block_size)
-    : boot_control_(boot_control),
-      block_size_(block_size) {}
+    BootControlInterface* boot_control, size_t block_size)
+    : boot_control_(boot_control), block_size_(block_size) {}
 
 bool PartitionUpdateGeneratorAndroid::
     GenerateOperationsForPartitionsNotInPayload(
diff --git a/payload_consumer/partition_writer_unittest.cc b/payload_consumer/partition_writer_unittest.cc
index c1ff4f4..1ef4783 100644
--- a/payload_consumer/partition_writer_unittest.cc
+++ b/payload_consumer/partition_writer_unittest.cc
@@ -81,14 +81,14 @@
 
   brillo::Blob PerformSourceCopyOp(const InstallOperation& op,
                                    const brillo::Blob blob_data) {
-    test_utils::ScopedTempFile source_partition("Blob-XXXXXX");
+    ScopedTempFile source_partition("Blob-XXXXXX");
     DirectExtentWriter extent_writer;
     FileDescriptorPtr fd(new EintrSafeFileDescriptor());
     EXPECT_TRUE(fd->Open(source_partition.path().c_str(), O_RDWR));
     EXPECT_TRUE(extent_writer.Init(fd, op.src_extents(), kBlockSize));
     EXPECT_TRUE(extent_writer.Write(blob_data.data(), blob_data.size()));
 
-    test_utils::ScopedTempFile target_partition("Blob-XXXXXX");
+    ScopedTempFile target_partition("Blob-XXXXXX");
 
     install_part_.source_path = source_partition.path();
     install_part_.target_path = target_partition.path();
@@ -120,7 +120,7 @@
 // file descriptor when the size of the error corrected one is too small.
 TEST_F(PartitionWriterTest, ErrorCorrectionSourceCopyWhenNoHashFallbackTest) {
   constexpr size_t kCopyOperationSize = 4 * 4096;
-  test_utils::ScopedTempFile source("Source-XXXXXX");
+  ScopedTempFile source("Source-XXXXXX");
   // Setup the source path with the right expected data.
   brillo::Blob expected_data = FakeFileDescriptorData(kCopyOperationSize);
   EXPECT_TRUE(test_utils::WriteFileVector(source.path(), expected_data));
@@ -172,7 +172,7 @@
 
 TEST_F(PartitionWriterTest, ChooseSourceFDTest) {
   constexpr size_t kSourceSize = 4 * 4096;
-  test_utils::ScopedTempFile source("Source-XXXXXX");
+  ScopedTempFile source("Source-XXXXXX");
   // Write invalid data to the source image, which doesn't match the expected
   // hash.
   brillo::Blob invalid_data(kSourceSize, 0x55);
diff --git a/payload_consumer/payload_verifier.cc b/payload_consumer/payload_verifier.cc
index 24e337e..85902c8 100644
--- a/payload_consumer/payload_verifier.cc
+++ b/payload_consumer/payload_verifier.cc
@@ -203,7 +203,7 @@
   //
   // openssl rsautl -verify -pubin -inkey <(echo pem_public_key)
   //   -in |sig_data| -out |out_hash_data|
-  RSA* rsa = EVP_PKEY_get0_RSA(public_key);
+  RSA* rsa = EVP_PKEY_get0_RSA(const_cast<EVP_PKEY*>(public_key));
 
   TEST_AND_RETURN_FALSE(rsa != nullptr);
   unsigned int keysize = RSA_size(rsa);
diff --git a/payload_consumer/postinstall_runner_action.cc b/payload_consumer/postinstall_runner_action.cc
index e8fa81b..91c3a64 100644
--- a/payload_consumer/postinstall_runner_action.cc
+++ b/payload_consumer/postinstall_runner_action.cc
@@ -63,9 +63,8 @@
   // that retains a small amount of system state such as enrollment and
   // network configuration. In both cases all user accounts are deleted.
   if (install_plan_.powerwash_required || install_plan_.is_rollback) {
-    bool save_rollback_data =
-        install_plan_.is_rollback && install_plan_.rollback_data_save_requested;
-    if (hardware_->SchedulePowerwash(save_rollback_data)) {
+    if (hardware_->SchedulePowerwash(
+            install_plan_.rollback_data_save_requested)) {
       powerwash_scheduled_ = true;
     } else {
       return CompletePostinstall(ErrorCode::kPostinstallPowerwashError);
diff --git a/payload_consumer/postinstall_runner_action_unittest.cc b/payload_consumer/postinstall_runner_action_unittest.cc
index cf5158b..5910c23 100644
--- a/payload_consumer/postinstall_runner_action_unittest.cc
+++ b/payload_consumer/postinstall_runner_action_unittest.cc
@@ -26,9 +26,14 @@
 
 #include <base/bind.h>
 #include <base/files/file_util.h>
+#if BASE_VER < 780000  // Android
 #include <base/message_loop/message_loop.h>
+#endif  // BASE_VER < 780000
 #include <base/strings/string_util.h>
 #include <base/strings/stringprintf.h>
+#if BASE_VER >= 780000  // CrOS
+#include <base/task/single_thread_task_executor.h>
+#endif  // BASE_VER >= 780000
 #include <brillo/message_loops/base_message_loop.h>
 #include <brillo/message_loops/message_loop_utils.h>
 #include <gmock/gmock.h>
@@ -156,8 +161,13 @@
   }
 
  protected:
+#if BASE_VER < 780000  // Android
   base::MessageLoopForIO base_loop_;
   brillo::BaseMessageLoop loop_{&base_loop_};
+#else   // CrOS
+  base::SingleThreadTaskExecutor base_loop_{base::MessagePumpType::IO};
+  brillo::BaseMessageLoop loop_{base_loop_.task_runner()};
+#endif  // BASE_VER < 780000
   brillo::AsynchronousSignalHandler async_signal_handler_;
   Subprocess subprocess_;
 
diff --git a/payload_consumer/verity_writer_android_unittest.cc b/payload_consumer/verity_writer_android_unittest.cc
index f943ce8..ec22ffb 100644
--- a/payload_consumer/verity_writer_android_unittest.cc
+++ b/payload_consumer/verity_writer_android_unittest.cc
@@ -39,7 +39,7 @@
 
   VerityWriterAndroid verity_writer_;
   InstallPlan::Partition partition_;
-  test_utils::ScopedTempFile temp_file_;
+  ScopedTempFile temp_file_;
 };
 
 TEST_F(VerityWriterAndroidTest, SimpleTest) {