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

chrome/browser/ui/views/frame/system_menu_insertion_delegate_win.h

 // Copyright (c) 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_SYSTEM_MENU_INSERTION_DELEGATE_WIN_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_SYSTEM_MENU_INSERTION_DELEGATE_WIN_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/views/controls/menu/menu_insertion_delegate_win.h"
 
 // SystemMenuInsertionDelegateWin is used to determine the index to insert menu
 // items into the system item. It is only needed on windows as that is the only
 // place we insert items into the system menu.
 class SystemMenuInsertionDelegateWin : public views::MenuInsertionDelegateWin {
  public:
   SystemMenuInsertionDelegateWin() {}
-  virtual ~SystemMenuInsertionDelegateWin() {}
+  ~SystemMenuInsertionDelegateWin() override {}
 
   // Overridden from views::MenuInsertionDelegateWin:
-  virtual int GetInsertionIndex(HMENU native_menu) override;
+  int GetInsertionIndex(HMENU native_menu) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SystemMenuInsertionDelegateWin);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_SYSTEM_MENU_INSERTION_DELEGATE_WIN_H_