mash: Migrate [Keyboard]Brightness code to ash/common.

ash/common/system/brightness_control_delegate.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 ASH_SYSTEM_BRIGHTNESS_CONTROL_DELEGATE_H_
-#define ASH_SYSTEM_BRIGHTNESS_CONTROL_DELEGATE_H_
+#ifndef ASH_COMMON_SYSTEM_BRIGHTNESS_CONTROL_DELEGATE_H_
+#define ASH_COMMON_SYSTEM_BRIGHTNESS_CONTROL_DELEGATE_H_
 
 #include "base/callback.h"
 
 namespace ui {
 class Accelerator;
 }  // namespace ui
 
 namespace ash {
 
 // Delegate for controlling the brightness.
@@ skipping 12 matching lines @@
   virtual void SetBrightnessPercent(double percent, bool gradual) = 0;
 
   // Asynchronously invokes |callback| with the current brightness, in the range
   // [0.0, 100.0].
   virtual void GetBrightnessPercent(
       const base::Callback<void(double)>& callback) = 0;
 };
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_BRIGHTNESS_CONTROL_DELEGATE_H_
+#endif  // ASH_COMMON_SYSTEM_BRIGHTNESS_CONTROL_DELEGATE_H_