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

chrome/browser/ui/toolbar/bookmark_sub_menu_model.h

 // Copyright (c) 2011 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_TOOLBAR_BOOKMARK_SUB_MENU_MODEL_H_
 #define CHROME_BROWSER_UI_TOOLBAR_BOOKMARK_SUB_MENU_MODEL_H_
 
 // For views and cocoa, we have complex delegate systems to handle
 // injecting the bookmarks to the bookmark submenu. This is done to support
 // advanced interactions with the menu contents, like right click context menus.
 
 #include "ui/base/models/simple_menu_model.h"
 
 class Browser;
 
 class BookmarkSubMenuModel : public ui::SimpleMenuModel {
  public:
   BookmarkSubMenuModel(ui::SimpleMenuModel::Delegate* delegate,
                        Browser* browser);
-  virtual ~BookmarkSubMenuModel();
+  ~BookmarkSubMenuModel() override;
 
  private:
   void Build(Browser* browser);
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkSubMenuModel);
 };
 
 #endif  // CHROME_BROWSER_UI_TOOLBAR_BOOKMARK_SUB_MENU_MODEL_H_