Remove #pragma once from content

content/common/message_router.h

 // Copyright (c) 2011 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 CONTENT_COMMON_MESSAGE_ROUTER_H_
 #define CONTENT_COMMON_MESSAGE_ROUTER_H_
-#pragma once
 
 #include "base/id_map.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 
 // The MessageRouter handles all incoming messages sent to it by routing them
 // to the correct listener.  Routing is based on the Message's routing ID.
 // Since routing IDs are typically assigned asynchronously by the browser
 // process, the MessageRouter has the notion of pending IDs for listeners that
 // have not yet been assigned a routing ID.
@@ skipping 36 matching lines @@
   IPC::Listener* ResolveRoute(int32 routing_id);
 
  private:
   // A list of all listeners with assigned routing IDs.
   IDMap<IPC::Listener> routes_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageRouter);
 };
 
 #endif  // CONTENT_COMMON_MESSAGE_ROUTER_H_