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

ash/system/network/sms_observer.h

 // Copyright 2017 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_SMS_OBSERVER_H_
-#define ASH_COMMON_SYSTEM_CHROMEOS_NETWORK_SMS_OBSERVER_H_
+#ifndef ASH_SYSTEM_NETWORK_SMS_OBSERVER_H_
+#define ASH_SYSTEM_NETWORK_SMS_OBSERVER_H_
 
 #include "chromeos/network/network_sms_handler.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace ash {
 
 // SmsObserver is called when a new sms message is received. Then it shows the
 // sms message to the user in the notification center.
 class SmsObserver : public chromeos::NetworkSmsHandler::Observer {
  public:
   SmsObserver();
   ~SmsObserver() override;
 
   // chromeos::NetworkSmsHandler::Observer:
   void MessageReceived(const base::DictionaryValue& message) override;
 
  private:
   // Used to create notification identifier.
   uint32_t message_id_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(SmsObserver);
 };
 
 }  // namespace ash
 
-#endif  // ASH_COMMON_SYSTEM_CHROMEOS_NETWORK_SMS_OBSERVER_H_
+#endif  // ASH_SYSTEM_NETWORK_SMS_OBSERVER_H_