MacViews: Remove redundant virtuals in NativeWidgetMac and co.

ui/views/controls/menu/menu_message_loop_mac.h

 // Copyright 2014 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_MENU_MENU_MESSAGE_LOOP_MAC_H_
 #define UI_VIEWS_CONTROLS_MENU_MENU_MESSAGE_LOOP_MAC_H_
 
 #include "base/compiler_specific.h"
 #include "ui/views/controls/menu/menu_message_loop.h"
 
 namespace views {
 
 class MenuMessageLoopMac : public MenuMessageLoop {
  public:
   MenuMessageLoopMac();
-  virtual ~MenuMessageLoopMac();
+  ~MenuMessageLoopMac() override;
 
   // Overridden from MenuMessageLoop:
-  virtual void Run(MenuController* controller,
-                   Widget* owner,
-                   bool nested_menu) override;
-  virtual void QuitNow() override;
-  virtual void RepostEventToWindow(const ui::LocatedEvent& event,
-                                   gfx::NativeWindow window,
-                                   const gfx::Point& screen_loc) override;
-  virtual void ClearOwner() override;
+  void Run(MenuController* controller,
+           Widget* owner,
+           bool nested_menu) override;
+  void QuitNow() override;
+  void RepostEventToWindow(const ui::LocatedEvent& event,
+                           gfx::NativeWindow window,
+                           const gfx::Point& screen_loc) override;
+  void ClearOwner() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MenuMessageLoopMac);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_MENU_MENU_MESSAGE_LOOP_MAC_H_