Remove #pragma once from chromeos

chromeos/dbus/mock_modem_messaging_client.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 CHROMEOS_DBUS_MOCK_MODEM_MESSAGING_CLIENT_H_
 #define CHROMEOS_DBUS_MOCK_MODEM_MESSAGING_CLIENT_H_
-#pragma once
 
 #include <string>
 
 #include "base/values.h"
 #include "chromeos/dbus/modem_messaging_client.h"
 #include "dbus/object_path.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace chromeos {
 
@@ skipping 13 matching lines @@
                             const dbus::ObjectPath& sms_path,
                             const DeleteCallback& callback));
   MOCK_METHOD3(List, void(const std::string& service_name,
                           const dbus::ObjectPath& object_path,
                           const ListCallback& callback));
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_MOCK_MODEM_MESSAGING_CLIENT_H_