Remove #pragma once from jingle

jingle/notifier/base/notification_method.h

 // Copyright (c) 2010 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 JINGLE_NOTIFIER_BASE_NOTIFICATION_METHOD_H_
 #define JINGLE_NOTIFIER_BASE_NOTIFICATION_METHOD_H_
-#pragma once
 
 #include <string>
 
 namespace notifier {
 
 enum NotificationMethod {
   // Old peer-to-peer notification method.  Currently only used for
   // testing.
   NOTIFICATION_P2P,
   // Server-issued notifications.  The default.
   NOTIFICATION_SERVER,
 };
 
 extern const NotificationMethod kDefaultNotificationMethod;
 
 std::string NotificationMethodToString(
     NotificationMethod notification_method);
 
 // If the given string is not one of "p2p" or "server", returns
 // kDefaultNotificationMethod.
 NotificationMethod StringToNotificationMethod(const std::string& str);
 
 }  // namespace notifier
 
 #endif  // JINGLE_NOTIFIER_BASE_NOTIFICATION_METHOD_H_