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

chrome/browser/chromeos/drive/file_system_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_system.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 40 matching lines @@
 
   (*counter)++;
   if (*counter >= expected_counter)
     quit.Run();
 }
 
 // This class is used to record directory changes and examine them later.
 class MockDirectoryChangeObserver : public FileSystemObserver {
  public:
   MockDirectoryChangeObserver() {}
-  virtual ~MockDirectoryChangeObserver() {}
+  ~MockDirectoryChangeObserver() override {}
 
   // FileSystemObserver overrides.
-  virtual void OnDirectoryChanged(
-      const base::FilePath& directory_path) override {
+  void OnDirectoryChanged(const base::FilePath& directory_path) override {
     changed_directories_.push_back(directory_path);
   }
 
-  virtual void OnFileChanged(const FileChange& new_file_change) override {
+  void OnFileChanged(const FileChange& new_file_change) override {
     changed_files_.Apply(new_file_change);
   }
 
   const std::vector<base::FilePath>& changed_directories() const {
     return changed_directories_;
   }
 
   const FileChange& changed_files() const { return changed_files_; }
 
  private:
   std::vector<base::FilePath> changed_directories_;
   FileChange changed_files_;
   DISALLOW_COPY_AND_ASSIGN(MockDirectoryChangeObserver);
 };
 
 }  // namespace
 
 class FileSystemTest : public testing::Test {
  protected:
-  virtual void SetUp() override {
+  void SetUp() override {
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     pref_service_.reset(new TestingPrefServiceSimple);
     test_util::RegisterDrivePrefs(pref_service_->registry());
 
     logger_.reset(new EventLogger);
     fake_drive_service_.reset(new FakeDriveService);
     test_util::SetUpTestEntries(fake_drive_service_.get());
 
     fake_free_disk_space_getter_.reset(new FakeFreeDiskSpaceGetter);
 
@@ skipping 866 matching lines @@
       kEmbedOrigin,
       google_apis::test_util::CreateCopyResultCallback(&error, &share_url));
   content::RunAllBlockingPoolTasksUntilIdle();
 
   // Verify the share url to the sharing dialog.
   EXPECT_EQ(FILE_ERROR_OK, error);
   EXPECT_TRUE(share_url.is_valid());
 }
 
 }   // namespace drive