Remove destruction-only TearDown() methods in Drive related test.

chrome/browser/chromeos/drive/change_list_processor_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/drive/change_list_processor.h"
 
 #include "base/files/scoped_temp_dir.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/drive/drive.pb.h"
@@ skipping 33 matching lines @@
 
     metadata_storage_.reset(new ResourceMetadataStorage(
         temp_dir_.path(), base::MessageLoopProxy::current()));
     ASSERT_TRUE(metadata_storage_->Initialize());
 
     metadata_.reset(new internal::ResourceMetadata(
         metadata_storage_.get(), base::MessageLoopProxy::current()));
     ASSERT_EQ(FILE_ERROR_OK, metadata_->Initialize());
   }
 
-  virtual void TearDown() OVERRIDE {
-    metadata_.reset();
-  }
-
   // Parses a json file at |test_data_path| relative to Chrome test directory
   // into a ScopedVector<drive::internal::ChangeList>.
   ScopedVector<ChangeList> ParseChangeList(const std::string& test_data_path) {
     ScopedVector<ChangeList> changes;
     changes.push_back(new ChangeList(
         *google_apis::ResourceList::ExtractAndParse(
             *google_apis::test_util::LoadJSONFile(
                 test_data_path))));
     return changes.Pass();
   }
@@ skipping 385 matching lines @@
 
   // The value is written in kTestJson.
   EXPECT_EQ(16730, metadata_->GetLargestChangestamp());
   EXPECT_FALSE(GetResourceEntry("drive/root/New Directory/new_pdf_file.pdf"));
 
   EXPECT_TRUE(changed_dirs.empty());
 }
 
 }  // namespace internal
 }  // namespace drive