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

chrome/browser/ui/webui/sync_file_system_internals/sync_file_system_internals_ui.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_SYNC_FILE_SYSTEM_INTERNALS_SYNC_FILE_SYSTEM_INTERNALS_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_SYNC_FILE_SYSTEM_INTERNALS_SYNC_FILE_SYSTEM_INTERNALS_UI_H_
 
 #include "content/public/browser/web_ui_controller.h"
 
 class SyncFileSystemInternalsUI : public content::WebUIController {
  public:
   explicit SyncFileSystemInternalsUI(content::WebUI* web_ui);
-  virtual ~SyncFileSystemInternalsUI();
+  ~SyncFileSystemInternalsUI() override;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(SyncFileSystemInternalsUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SYNC_FILE_SYSTEM_INTERNALS_SYNC_FILE_SYSTEM_INTERNALS_UI_H_