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

chrome/browser/ui/webui/app_list/start_page_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_APP_LIST_START_PAGE_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_APP_LIST_START_PAGE_UI_H_
 
 #include "base/basictypes.h"
 #include "content/public/browser/web_ui_controller.h"
 
 namespace app_list {
 
 // StartPageUI for the app launcher start page.
 class StartPageUI : public content::WebUIController {
  public:
   explicit StartPageUI(content::WebUI* web_ui);
-  virtual ~StartPageUI();
+  ~StartPageUI() override;
 
  private:
   // Initializes the data source used for this webui.
   void InitDataSource();
 
   DISALLOW_COPY_AND_ASSIGN(StartPageUI);
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_WEBUI_APP_LIST_START_PAGE_UI_H_