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

ash/common/system/chromeos/brightness/brightness_controller_chromeos.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_CHROMEOS_BRIGHTNESS_BRIGHTNESS_CONTROLLER_CHROMEOS_H_
-#define ASH_SYSTEM_CHROMEOS_BRIGHTNESS_BRIGHTNESS_CONTROLLER_CHROMEOS_H_
+#ifndef ASH_COMMON_SYSTEM_CHROMEOS_BRIGHTNESS_BRIGHTNESS_CONTROLLER_CHROMEOS_H_
+#define ASH_COMMON_SYSTEM_CHROMEOS_BRIGHTNESS_BRIGHTNESS_CONTROLLER_CHROMEOS_H_
 
 #include "ash/ash_export.h"
-#include "ash/system/brightness_control_delegate.h"
+#include "ash/common/system/brightness_control_delegate.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 
 namespace ash {
 namespace system {
 
 // A class which controls brightness when F6, F7 or a multimedia key for
 // brightness is pressed.
 class ASH_EXPORT BrightnessControllerChromeos
     : public ash::BrightnessControlDelegate {
  public:
   BrightnessControllerChromeos() {}
   ~BrightnessControllerChromeos() override {}
 
   // Overridden from ash::BrightnessControlDelegate:
   void HandleBrightnessDown(const ui::Accelerator& accelerator) override;
   void HandleBrightnessUp(const ui::Accelerator& accelerator) override;
   void SetBrightnessPercent(double percent, bool gradual) override;
   void GetBrightnessPercent(
       const base::Callback<void(double)>& callback) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BrightnessControllerChromeos);
 };
 
 }  // namespace system
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_CHROMEOS_BRIGHTNESS_BRIGHTNESS_CONTROLLER_CHROMEOS_H_
+#endif  // ASH_COMMON_SYSTEM_CHROMEOS_BRIGHTNESS_BRIGHTNESS_CONTROLLER_CHROMEOS_H_