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

chrome/browser/chromeos/drive/drive_integration_service_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/drive_integration_service.h"
 
 #include "chrome/browser/chromeos/drive/dummy_file_system.h"
 #include "chrome/browser/chromeos/drive/test_util.h"
 #include "chrome/browser/drive/dummy_drive_service.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace drive {
 
 class DriveIntegrationServiceTest : public testing::Test {
  public:
   virtual void SetUp() OVERRIDE {
     profile_.reset(new TestingProfile);
     integration_service_.reset(new DriveIntegrationService(
         profile_.get(),
         new DummyDriveService,
         base::FilePath(),
         new DummyFileSystem));
   }
 
-  virtual void TearDown() OVERRIDE {
-    integration_service_.reset();
-    google_apis::test_util::RunBlockingPoolTask();
-    profile_.reset();
-  }
-
  protected:
   content::TestBrowserThreadBundle thread_bundle_;
   scoped_ptr<TestingProfile> profile_;
   scoped_ptr<DriveIntegrationService> integration_service_;
 };
 
 TEST_F(DriveIntegrationServiceTest, InitializeAndShutdown) {
   integration_service_->Initialize();
   google_apis::test_util::RunBlockingPoolTask();
   integration_service_->Shutdown();
 }
 
 }  // namespace drive