Revert "Use reference counted pointers for ApkAssets"

This reverts commit c357f719ed3734aee05418808699a48dd150a1a5.

Reason for revert: b/279154343 - performance regression

Change-Id: If2e212d8fc5b9ed8638032a33f450440cbaeceb0
diff --git a/cmds/idmap2/tests/ResourceUtilsTests.cpp b/cmds/idmap2/tests/ResourceUtilsTests.cpp
index 011040b..6914208 100644
--- a/cmds/idmap2/tests/ResourceUtilsTests.cpp
+++ b/cmds/idmap2/tests/ResourceUtilsTests.cpp
@@ -38,7 +38,7 @@
     apk_assets_ = ApkAssets::Load(GetTargetApkPath());
     ASSERT_THAT(apk_assets_, NotNull());
 
-    am_.SetApkAssets({apk_assets_});
+    am_.SetApkAssets({apk_assets_.get()});
   }
 
   const AssetManager2& GetAssetManager() {
@@ -47,7 +47,7 @@
 
  private:
   AssetManager2 am_;
-  AssetManager2::ApkAssetsPtr apk_assets_;
+  std::unique_ptr<const ApkAssets> apk_assets_;
 };
 
 TEST_F(ResourceUtilsTests, ResToTypeEntryName) {