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

chrome/browser/ui/webui/signin/user_manager_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_SIGNIN_USER_MANAGER_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_SIGNIN_USER_MANAGER_UI_H_
 
 #include "content/public/browser/web_ui_controller.h"
 
 class UserManagerScreenHandler;
 
 namespace base {
 class DictionaryValue;
 }
 namespace content {
 class WebUIDataSource;
 }
 
 // A WebUI dialog to display available users.
 class UserManagerUI : public content::WebUIController {
  public:
   explicit UserManagerUI(content::WebUI* web_ui);
-  virtual ~UserManagerUI();
+  ~UserManagerUI() override;
 
  private:
   content::WebUIDataSource* CreateUIDataSource(
       const base::DictionaryValue& localized_strings);
   void GetLocalizedStrings(base::DictionaryValue* localized_strings);
 
   UserManagerScreenHandler* user_manager_screen_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(UserManagerUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SIGNIN_USER_MANAGER_UI_H_