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

chrome/browser/ui/views/apps/app_window_desktop_window_tree_host_win.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 CHROME_BROWSER_UI_VIEWS_APPS_APP_WINDOW_DESKTOP_WINDOW_TREE_HOST_WIN_H_
 #define CHROME_BROWSER_UI_VIEWS_APPS_APP_WINDOW_DESKTOP_WINDOW_TREE_HOST_WIN_H_
 
 #include "ui/views/widget/desktop_aura/desktop_window_tree_host_win.h"
 
 namespace views {
 class DesktopNativeWidgetAura;
 }
 
 class ChromeNativeAppWindowViewsWin;
 
 // AppWindowDesktopWindowTreeHostWin handles updating the glass of app frames on
 // Windows. It is used for all desktop app windows on Windows, but is only
 // actively doing anything when a glass window frame is being used.
 class AppWindowDesktopWindowTreeHostWin
     : public views::DesktopWindowTreeHostWin {
  public:
   AppWindowDesktopWindowTreeHostWin(
       ChromeNativeAppWindowViewsWin* app_window,
       views::DesktopNativeWidgetAura* desktop_native_widget_aura);
-  virtual ~AppWindowDesktopWindowTreeHostWin();
+  ~AppWindowDesktopWindowTreeHostWin() override;
 
  private:
   // Overridden from DesktopWindowTreeHostWin:
-  virtual bool GetClientAreaInsets(gfx::Insets* insets) const override;
-  virtual void HandleFrameChanged() override;
-  virtual void PostHandleMSG(UINT message,
-                             WPARAM w_param,
-                             LPARAM l_param) override;
+  bool GetClientAreaInsets(gfx::Insets* insets) const override;
+  void HandleFrameChanged() override;
+  void PostHandleMSG(UINT message, WPARAM w_param, LPARAM l_param) override;
 
   // Updates the glass frame area by calling the DwmExtendFrameIntoClientArea
   // Windows function.
   void UpdateDWMFrame();
 
   ChromeNativeAppWindowViewsWin* app_window_;
 
   DISALLOW_COPY_AND_ASSIGN(AppWindowDesktopWindowTreeHostWin);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_APPS_APP_WINDOW_DESKTOP_WINDOW_TREE_HOST_WIN_H_