Update {virtual,override,final} to follow C++11 style in chrome/browser/chromeos/drive.

chrome/browser/chromeos/drive/remove_stale_cache_files_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 <string>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chromeos/drive/drive.pb.h"
 #include "chrome/browser/chromeos/drive/fake_free_disk_space_getter.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
 #include "chrome/browser/chromeos/drive/remove_stale_cache_files.h"
 #include "chrome/browser/chromeos/drive/resource_metadata.h"
 #include "chrome/browser/chromeos/drive/test_util.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "google_apis/drive/test_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace drive {
 namespace internal {
 
 class RemoveStaleCacheFilesTest : public testing::Test {
  protected:
-  virtual void SetUp() override {
+  void SetUp() override {
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
 
     fake_free_disk_space_getter_.reset(new FakeFreeDiskSpaceGetter);
 
     metadata_storage_.reset(new ResourceMetadataStorage(
         temp_dir_.path(), base::MessageLoopProxy::current().get()));
 
     cache_.reset(new FileCache(metadata_storage_.get(),
                                temp_dir_.path(),
                                base::MessageLoopProxy::current().get(),
@@ skipping 67 matching lines @@
   RemoveStaleCacheFiles(cache_.get(), resource_metadata_.get());
 
   // Dirty cache should not be removed even though its MD5 doesn't match.
   EXPECT_EQ(FILE_ERROR_OK,
             resource_metadata_->GetResourceEntryById(local_id, &entry));
   EXPECT_TRUE(entry.file_specific_info().cache_state().is_present());
 }
 
 }  // namespace internal
 }  // namespace drive