Get rid of ipc_sender.h include in ipc_message.h.

content/browser/renderer_host/p2p/socket_host.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_BROWSER_RENDERER_HOST_P2P_SOCKET_HOST_H_
 #define CONTENT_BROWSER_RENDERER_HOST_P2P_SOCKET_HOST_H_
 
 #include "content/common/content_export.h"
 #include "content/common/p2p_sockets.h"
 
-#include "ipc/ipc_message.h"
 #include "net/base/ip_endpoint.h"
 
+namespace IPC {
+class Sender;
+}
+
 namespace content {
 
 // Base class for P2P sockets.
 class CONTENT_EXPORT P2PSocketHost {
  public:
   // Creates P2PSocketHost of the specific type.
   static P2PSocketHost* Create(IPC::Sender* message_sender,
                                int id, P2PSocketType type);
 
   virtual ~P2PSocketHost();
@@ skipping 55 matching lines @@
   IPC::Sender* message_sender_;
   int id_;
   State state_;
 
   DISALLOW_COPY_AND_ASSIGN(P2PSocketHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_P2P_SOCKET_HOST_H_