Standardize usage of virtual/override/final specifiers.

ui/views/controls/button/menu_button.h

 // Copyright (c) 2012 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 UI_VIEWS_CONTROLS_BUTTON_MENU_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_MENU_BUTTON_H_
 
 #include <string>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 32 matching lines @@
 
   // How much padding to put on the left and right of the menu marker.
   static const int kMenuMarkerPaddingLeft;
   static const int kMenuMarkerPaddingRight;
 
   // Create a Button.
   MenuButton(ButtonListener* listener,
              const base::string16& text,
              MenuButtonListener* menu_button_listener,
              bool show_menu_marker);
-  virtual ~MenuButton();
+  ~MenuButton() override;
 
   bool show_menu_marker() const { return show_menu_marker_; }
   void set_menu_marker(const gfx::ImageSkia* menu_marker) {
     menu_marker_ = menu_marker;
   }
   const gfx::ImageSkia* menu_marker() const { return menu_marker_; }
 
   const gfx::Point& menu_offset() const { return menu_offset_; }
   void set_menu_offset(int x, int y) { menu_offset_.SetPoint(x, y); }
 
@@ skipping 64 matching lines @@
   int pressed_lock_count_;
 
   base::WeakPtrFactory<MenuButton> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MenuButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_MENU_BUTTON_H_