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

chrome/browser/chromeos/drive/file_cache_metadata_unittest.cc

 // Copyright (c) 2012 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/file_cache_metadata.h"
 
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "chrome/browser/chromeos/drive/drive.pb.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
 #include "chrome/browser/chromeos/drive/test_util.h"
 #include "chrome/browser/google_apis/test_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace drive {
 namespace internal {
 
 class FileCacheMetadataTest : public testing::Test {
  public:
-  FileCacheMetadataTest() {}
-
   virtual void SetUp() OVERRIDE {
     // Create cache directories.
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     metadata_.reset(new FileCacheMetadata(NULL));
   }
 
-  virtual void TearDown() OVERRIDE {
-    metadata_.reset();
-  }
-
  protected:
   base::ScopedTempDir temp_dir_;
   scoped_ptr<FileCacheMetadata> metadata_;
 };
 
 // Test all the methods of FileCacheMetadata except for
 // RemoveTemporaryFiles.
 TEST_F(FileCacheMetadataTest, CacheTest) {
   ASSERT_EQ(FileCacheMetadata::INITIALIZE_CREATED,
             metadata_->Initialize(temp_dir_.path().AppendASCII("test.db")));
@@ skipping 82 matching lines @@
   // Try to open a nonexistent path.
   base::FilePath non_existent_path(FILE_PATH_LITERAL(
       "/somewhere/nonexistent/test.db"));
   metadata_.reset(new FileCacheMetadata(NULL));
   EXPECT_EQ(FileCacheMetadata::INITIALIZE_FAILED,
             metadata_->Initialize(non_existent_path));
 }
 
 }  // namespace internal
 }  // namespace drive