Revert "update_engine: Migrate build system to gyp."

This reverts commit 0d98d921d1ba82dc496bb98e7dedd4f3baaf67de.

Several canary bot (at least link, ivybridge, peach, beltino) failed with the following:

Generating delta update
Patching kernel /tmp/cbuildbot-tmpkZN69N/tmpXG3Fv3/paygen_payload.wqtif7/cros_generate_update_payload.dsXzrS
   into /tmp/cbuildbot-tmpkZN69N/tmpXG3Fv3/paygen_payload.wqtif7/src_image.bin
/dev/loop19 has been unmounted
rmdir: removing directory, `/tmp/cbuildbot-tmpkZN69N/tmpXG3Fv3/paygen_payload.wqtif7/state.MtVYXo'
md5sum of src kernel:
84f3098b6822080aa2101f7623a8ebec  /tmp/cbuildbot-tmpkZN69N/tmpXG3Fv3/paygen_payload.wqtif7/cros_generate_update_payload.dsXzrS
md5sum of src root:
ed15fa4b6fab97b1d2704c109a95f366  /tmp/cbuildbot-tmpkZN69N/tmpXG3Fv3/paygen_payload.wqtif7/cros_generate_update_payload.S3qwDy
Patching kernel /tmp/cbuildbot-tmpkZN69N/tmpXG3Fv3/paygen_payload.wqtif7/cros_generate_update_payload.M1kqWN
   into /tmp/cbuildbot-tmpkZN69N/tmpXG3Fv3/paygen_payload.wqtif7/tgt_image.bin
/dev/loop21 has been unmounted
rmdir: removing directory, `/tmp/cbuildbot-tmpkZN69N/tmpXG3Fv3/paygen_payload.wqtif7/state.M80v7t'
Using rootfs partition size: 2147483648
ERROR: something wrong with flag 'old_dir' in file '../../../../../../tmp/portage/chromeos-base/update_engine-0.0.2-r646/work/update_engine-0.0.2/platform2/update_engine/payload_generator/generate_delta_main.cc'.  One possibility: file '../../../../../../dev/loop10 has been unmounted
rmdir: removing directory, `/tmp/cbuildbot-tmpkZN69N/tmpXG3Fv3/paygen_payload.wqtif7/src_root.Amedwg'
/dev/loop5 has been unmounted
rmdir: removing directory, `/tmp/cbuildbot-tmpkZN69N/tmpXG3Fv3/paygen_payload.wqtif7/src_root.7rMVQV'
Cleanup success after an error.

This CL appears to be the only one related to the update_engine. Revert it first and see if the buildbot will recover.

Change-Id: Ia42b19a808ae9c95cd600e4f585adbf2e7511395
Reviewed-on: https://chromium-review.googlesource.com/208257
Reviewed-by: Chun-ta Lin <itspeter@chromium.org>
Commit-Queue: Chun-ta Lin <itspeter@chromium.org>
Tested-by: Chun-ta Lin <itspeter@chromium.org>
diff --git a/delta_performer_unittest.cc b/delta_performer_unittest.cc
index 226427f..8d4eacd 100644
--- a/delta_performer_unittest.cc
+++ b/delta_performer_unittest.cc
@@ -196,9 +196,9 @@
   // Generates a new private key that will not match the public key.
   if (signature_test == kSignatureGeneratedShellBadKey) {
     LOG(INFO) << "Generating a mismatched private key.";
-    ASSERT_EQ(0, System(base::StringPrintf(
-        "%s genrsa -out %s 2048",
-        utils::GetPathOnBoard("openssl").c_str(), private_key_path.c_str())));
+    ASSERT_EQ(0,
+              System(base::StringPrintf("openssl genrsa -out %s 2048",
+                                        private_key_path.c_str())));
   }
   int signature_size = GetSignatureSize(private_key_path);
   string hash_file;
@@ -230,8 +230,7 @@
   ScopedPathUnlinker sig_unlinker(sig_file);
   ASSERT_EQ(0,
             System(base::StringPrintf(
-                "%s rsautl -raw -sign -inkey %s -in %s -out %s",
-                utils::GetPathOnBoard("openssl").c_str(),
+                "openssl rsautl -raw -sign -inkey %s -in %s -out %s",
                 private_key_path.c_str(),
                 hash_file.c_str(),
                 sig_file.c_str())));
@@ -242,8 +241,7 @@
       signature_test == kSignatureGeneratedShellRotateCl2) {
     ASSERT_EQ(0,
               System(base::StringPrintf(
-                  "%s rsautl -raw -sign -inkey %s -in %s -out %s",
-                  utils::GetPathOnBoard("openssl").c_str(),
+                  "openssl rsautl -raw -sign -inkey %s -in %s -out %s",
                   kUnittestPrivateKey2Path,
                   hash_file.c_str(),
                   sig_file2.c_str())));