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

ash/system/network/tray_network_state_observer.h

 // Copyright (c) 2012 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_NETWORK_TRAY_NETWORK_STATE_OBSERVER_H_
-#define ASH_COMMON_SYSTEM_CHROMEOS_NETWORK_TRAY_NETWORK_STATE_OBSERVER_H_
+#ifndef ASH_SYSTEM_NETWORK_TRAY_NETWORK_STATE_OBSERVER_H_
+#define ASH_SYSTEM_NETWORK_TRAY_NETWORK_STATE_OBSERVER_H_
 
 #include "base/macros.h"
 #include "base/timer/timer.h"
 #include "chromeos/network/network_state_handler_observer.h"
 
 namespace ash {
 
 class TrayNetworkStateObserver : public chromeos::NetworkStateHandlerObserver {
  public:
   class Delegate {
@@ skipping 34 matching lines @@
   int update_frequency_;
 
   // Timer used to limit the frequency of NetworkStateChanged updates.
   base::OneShotTimer timer_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayNetworkStateObserver);
 };
 
 }  // namespace ash
 
-#endif  // ASH_COMMON_SYSTEM_CHROMEOS_NETWORK_TRAY_NETWORK_STATE_OBSERVER_H_
+#endif  // ASH_SYSTEM_NETWORK_TRAY_NETWORK_STATE_OBSERVER_H_