mash: Convert system tray network item to wm common types

ash/common/system/chromeos/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_SYSTEM_CHROMEOS_NETWORK_TRAY_NETWORK_STATE_OBSERVER_H
-#define ASH_SYSTEM_CHROMEOS_NETWORK_TRAY_NETWORK_STATE_OBSERVER_H
+#ifndef ASH_COMMON_SYSTEM_CHROMEOS_NETWORK_TRAY_NETWORK_STATE_OBSERVER_H_
+#define ASH_COMMON_SYSTEM_CHROMEOS_NETWORK_TRAY_NETWORK_STATE_OBSERVER_H_
 
-#include <string>
-
-#include "base/compiler_specific.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 {
    public:
@@ skipping 33 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_SYSTEM_CHROMEOS_NETWORK_TRAY_NETWORK_STATE_OBSERVER_H
+#endif  // ASH_COMMON_SYSTEM_CHROMEOS_NETWORK_TRAY_NETWORK_STATE_OBSERVER_H_