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

ipc/ipc_message.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 IPC_IPC_MESSAGE_H_
 #define IPC_IPC_MESSAGE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/debug/trace_event.h"
 #include "base/pickle.h"
 #include "ipc/ipc_export.h"
 
-// TODO(brettw) remove this and update files that depend on this being included
-// from here.
-#include "ipc/ipc_sender.h"
-
 #if !defined(NDEBUG)
 #define IPC_MESSAGE_LOG_ENABLED
 #endif
 
 #if defined(OS_POSIX)
 #include "base/memory/ref_counted.h"
 #endif
 
 namespace base {
 struct FileDescriptor;
 }
 
 class FileDescriptorSet;
 
 namespace IPC {
 
 //------------------------------------------------------------------------------
 
-class Channel;
-class Message;
 struct LogData;
 
 class IPC_EXPORT Message : public Pickle {
  public:
   enum PriorityValue {
     PRIORITY_LOW = 1,
     PRIORITY_NORMAL,
     PRIORITY_HIGH
   };
 
@@ skipping 241 matching lines @@
   MSG_ROUTING_NONE = -2,
 
   // indicates a general message not sent to a particular tab.
   MSG_ROUTING_CONTROL = kint32max,
 };
 
 #define IPC_REPLY_ID 0xFFFFFFF0  // Special message id for replies
 #define IPC_LOGGING_ID 0xFFFFFFF1  // Special message id for logging
 
 #endif  // IPC_IPC_MESSAGE_H_