replace OVERRIDE and FINAL with override and final in ash/

ash/system/chromeos/keyboard_brightness_controller.h

 // Copyright (c) 2012 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 ASH_SYSTEM_CHROMEOS_KEYBOARD_BRIGHTNESS_CONTROLLER_H_
 #define ASH_SYSTEM_CHROMEOS_KEYBOARD_BRIGHTNESS_CONTROLLER_H_
 
 #include "ash/ash_export.h"
 #include "ash/system/keyboard_brightness/keyboard_brightness_control_delegate.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 
 namespace ash {
 
 // A class which controls keyboard brightness when Alt+F6, Alt+F7 or a
 // multimedia key for keyboard brightness is pressed.
 class ASH_EXPORT KeyboardBrightnessController
     : public KeyboardBrightnessControlDelegate {
  public:
   KeyboardBrightnessController() {}
   virtual ~KeyboardBrightnessController() {}
 
  private:
   // Overridden from KeyboardBrightnessControlDelegate:
   virtual bool HandleKeyboardBrightnessDown(
-      const ui::Accelerator& accelerator) OVERRIDE;
+      const ui::Accelerator& accelerator) override;
   virtual bool HandleKeyboardBrightnessUp(
-      const ui::Accelerator& accelerator) OVERRIDE;
+      const ui::Accelerator& accelerator) override;
 
   DISALLOW_COPY_AND_ASSIGN(KeyboardBrightnessController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CHROMEOS_KEYBOARD_BRIGHTNESS_CONTROLLER_H_