chromeos: Move files in //ash/common to //ash

ash/system/power/power_event_observer.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_POWER_POWER_EVENT_OBSERVER_H_
-#define ASH_SYSTEM_CHROMEOS_POWER_POWER_EVENT_OBSERVER_H_
+#ifndef ASH_SYSTEM_POWER_POWER_EVENT_OBSERVER_H_
+#define ASH_SYSTEM_POWER_POWER_EVENT_OBSERVER_H_
 
 #include "ash/ash_export.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "chromeos/dbus/power_manager_client.h"
 #include "chromeos/dbus/session_manager_client.h"
 
 namespace ash {
 
@@ skipping 30 matching lines @@
   // If set, called when the lock screen animations have completed to confirm
   // that the system is ready to be suspended.
   base::Closure screen_lock_callback_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PowerEventObserver);
 };
 
 }  // namespace chromeos
 
-#endif  // ASH_SYSTEM_CHROMEOS_POWER_POWER_EVENT_OBSERVER_H_
+#endif  // ASH_SYSTEM_POWER_POWER_EVENT_OBSERVER_H_