Add OVERRIDE to chrome/browser/chromeos/.

chrome/browser/chromeos/views/dropdown_button.h

 // Copyright (c) 2011 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_CHROMEOS_VIEWS_DROPDOWN_BUTTON_H_
 #define CHROME_BROWSER_CHROMEOS_VIEWS_DROPDOWN_BUTTON_H_
 #pragma once
 
 #include <string>
 
+#include "base/compiler_specific.h"
 #include "views/controls/button/menu_button.h"
 
 namespace chromeos {
 
 // MenuButton specification that uses different icons to draw the button and
 // adjust focus frame accordingly to the icons particularities.
 class DropDownButton : public views::MenuButton {
  public:
   DropDownButton(views::ButtonListener* listener,
                  const string16& text,
                  views::ViewMenuDelegate* menu_delegate,
                  bool show_menu_marker);
   virtual ~DropDownButton();
 
-  virtual void OnPaintFocusBorder(gfx::Canvas* canvas);
+  virtual void OnPaintFocusBorder(gfx::Canvas* canvas) OVERRIDE;
 
   // Override SetText to set the accessible value, rather than the
   // accessible name, since this acts more like a combo box than a
   // menu.
-  virtual void SetText(const string16& text);
+  virtual void SetText(const string16& text) OVERRIDE;
 
   virtual string16 GetAccessibleValue();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DropDownButton);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_VIEWS_DROPDOWN_BUTTON_H_