Standardize usage of virtual/override/final in chrome/browser/sync_file_system/

chrome/browser/sync_file_system/drive_backend/drive_backend_sync_unittest.cc

 // Copyright 2014 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 <algorithm>
 #include <stack>
 
 #include "base/files/file_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 137 matching lines @@
     local_sync_service_->Shutdown();
 
     fake_drive_service_helper_.reset();
     local_sync_service_.reset();
     remote_sync_service_.reset();
 
     content::RunAllBlockingPoolTasksUntilIdle();
     RevokeSyncableFileSystem();
   }
 
-  virtual void OnRemoteChangeQueueUpdated(int64 pending_changes_hint) override {
+  void OnRemoteChangeQueueUpdated(int64 pending_changes_hint) override {
     pending_remote_changes_ = pending_changes_hint;
   }
 
-  virtual void OnLocalChangeAvailable(int64 pending_changes_hint) override {
+  void OnLocalChangeAvailable(int64 pending_changes_hint) override {
     pending_local_changes_ = pending_changes_hint;
   }
 
  protected:
   storage::FileSystemURL CreateURL(const std::string& app_id,
                                    const base::FilePath::StringType& path) {
     return CreateURL(app_id, base::FilePath(path));
   }
 
   storage::FileSystemURL CreateURL(const std::string& app_id,
@@ skipping 1547 matching lines @@
 
   EXPECT_EQ(1u, CountApp());
   EXPECT_EQ(1u, CountLocalFile(app_id));
 
   EXPECT_EQ(2u, CountMetadata());
   EXPECT_EQ(2u, CountTracker());
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system