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

ash/system/network/sms_observer.h

Index: ash/system/network/sms_observer.h
diff --git a/ash/system/network/sms_observer.h b/ash/system/network/sms_observer.h
deleted file mode 100644
index b304005f856dca75d1e2956072f97d60de295a4c..0000000000000000000000000000000000000000
--- a/ash/system/network/sms_observer.h
+++ /dev/null
@@ -1,35 +0,0 @@
-// 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_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_SYSTEM_NETWORK_SMS_OBSERVER_H_