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

chrome/browser/chromeos/drive/file_system/operation_test_base.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/file_system/operation_test_base.h"
 
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/chromeos/drive/change_list_loader.h"
 #include "chrome/browser/chromeos/drive/fake_free_disk_space_getter.h"
 #include "chrome/browser/chromeos/drive/file_cache.h"
@@ skipping 93 matching lines @@
   internal::ChangeListLoader change_list_loader(
       blocking_task_runner_.get(), metadata_.get(), scheduler_.get());
 
   change_list_loader.LoadIfNeeded(
       DirectoryFetchInfo(),
       google_apis::test_util::CreateCopyResultCallback(&error));
   google_apis::test_util::RunBlockingPoolTask();
   ASSERT_EQ(FILE_ERROR_OK, error);
 }
 
-void OperationTestBase::TearDown() {
-  cache_.reset();
-  fake_free_disk_space_getter_.reset();
-  metadata_.reset();
-  scheduler_.reset();
-  fake_drive_service_.reset();
-  profile_.reset();
-
-  blocking_task_runner_ = NULL;
-}
-
 FileError OperationTestBase::GetLocalResourceEntry(const base::FilePath& path,
                                                    ResourceEntry* entry) {
   FileError error = FILE_ERROR_FAILED;
   base::PostTaskAndReplyWithResult(
       blocking_task_runner(),
       FROM_HERE,
       base::Bind(&internal::ResourceMetadata::GetResourceEntryByPath,
                  base::Unretained(metadata()), path, entry),
       base::Bind(google_apis::test_util::CreateCopyResultCallback(&error)));
   google_apis::test_util::RunBlockingPoolTask();
   return error;
 }
 
 }  // namespace file_system
 }  // namespace drive