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

ash/system/system_clock_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_COMMON_SYSTEM_CHROMEOS_SYSTEM_CLOCK_OBSERVER_H_
-#define ASH_COMMON_SYSTEM_CHROMEOS_SYSTEM_CLOCK_OBSERVER_H_
+#ifndef ASH_SYSTEM_SYSTEM_CLOCK_OBSERVER_H_
+#define ASH_SYSTEM_SYSTEM_CLOCK_OBSERVER_H_
 
 #include "base/macros.h"
 #include "chromeos/dbus/system_clock_client.h"
 #include "chromeos/settings/timezone_settings.h"
 
 namespace ash {
 
 class SystemClockObserver
     : public chromeos::SystemClockClient::Observer,
       public chromeos::system::TimezoneSettings::Observer {
@@ skipping 11 matching lines @@
   bool can_set_time() { return can_set_time_; }
 
  private:
   bool can_set_time_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemClockObserver);
 };
 
 }  // namespace ash
 
-#endif  // ASH_COMMON_SYSTEM_CHROMEOS_SYSTEM_CLOCK_OBSERVER_H_
+#endif  // ASH_SYSTEM_SYSTEM_CLOCK_OBSERVER_H_