Update {virtual,override} to follow C++11 style in chrome.

chrome/browser/ui/views/frame/browser_frame_ashwin.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_VIEWS_FRAME_BROWSER_FRAME_ASHWIN_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_FRAME_ASHWIN_H_
 
 #include "chrome/browser/ui/views/frame/browser_frame_ash.h"
 
 // A NativeWidgetAura subclass that provides Windows-specific behavior on the
 // Ash desktop for Metro mode.
 class BrowserFrameAshWin : public BrowserFrameAsh {
  public:
   BrowserFrameAshWin(BrowserFrame* browser_frame, BrowserView* browser_view);
 
  protected:
-  virtual ~BrowserFrameAshWin();
+  ~BrowserFrameAshWin() override;
 
   // Overridden from aura::client::ActivationChangeObserver:
-  virtual void OnWindowFocused(aura::Window* gained_focus,
-                               aura::Window* lost_focus) override;
+  void OnWindowFocused(aura::Window* gained_focus,
+                       aura::Window* lost_focus) override;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(BrowserFrameAshWin);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_FRAME_ASHWIN_H_