chromeos: Move files in //ash/common to //ash, part 1

ash/system/power/battery_notification.h

 // Copyright 2015 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_COMMON_SYSTEM_CHROMEOS_POWER_BATTERY_NOTIFICATION_H_
-#define ASH_COMMON_SYSTEM_CHROMEOS_POWER_BATTERY_NOTIFICATION_H_
+#ifndef ASH_SYSTEM_POWER_BATTERY_NOTIFICATION_H_
+#define ASH_SYSTEM_POWER_BATTERY_NOTIFICATION_H_
 
 #include "ash/ash_export.h"
-#include "ash/common/system/chromeos/power/tray_power.h"
+#include "ash/system/power/tray_power.h"
 #include "base/macros.h"
 
 namespace message_center {
 class MessageCenter;
 }
 
 namespace ash {
 
 // Class for showing and hiding a MessageCenter low battery notification.
 class ASH_EXPORT BatteryNotification {
  public:
   BatteryNotification(message_center::MessageCenter* message_center,
                       TrayPower::NotificationState notification_state);
   ~BatteryNotification();
 
   // Updates the notification if it still exists.
   void Update(TrayPower::NotificationState notification_state);
 
  private:
   message_center::MessageCenter* message_center_;
 
   DISALLOW_COPY_AND_ASSIGN(BatteryNotification);
 };
 
 }  // namespace ash
 
-#endif  // ASH_COMMON_SYSTEM_CHROMEOS_POWER_BATTERY_NOTIFICATION_H_
+#endif  // ASH_SYSTEM_POWER_BATTERY_NOTIFICATION_H_