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

chrome/browser/ui/tabs/tab_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_TABS_TAB_MENU_MODEL_H_
 #define CHROME_BROWSER_UI_TABS_TAB_MENU_MODEL_H_
 
 #include "ui/base/models/simple_menu_model.h"
 
 class TabStripModel;
 
 // A menu model that builds the contents of the tab context menu. To make sure
 // the menu reflects the real state of the tab a new TabMenuModel should be
 // created each time the menu is shown.
 class TabMenuModel : public ui::SimpleMenuModel {
  public:
   TabMenuModel(ui::SimpleMenuModel::Delegate* delegate,
                TabStripModel* tab_strip,
                int index);
-  virtual ~TabMenuModel() {}
+  ~TabMenuModel() override {}
 
  private:
   void Build(TabStripModel* tab_strip, int index);
 
   DISALLOW_COPY_AND_ASSIGN(TabMenuModel);
 };
 
 #endif  // CHROME_BROWSER_UI_TABS_TAB_MENU_MODEL_H_