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

ipc/ipc_logging.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 IPC_IPC_LOGGING_H_
 #define IPC_IPC_LOGGING_H_
 
 #include "ipc/ipc_message.h"  // For IPC_MESSAGE_LOG_ENABLED.
 
 #ifdef IPC_MESSAGE_LOG_ENABLED
@@ skipping 10 matching lines @@
 // UTF-8.
 typedef void (*LogFunction)(std::string* name,
                             const IPC::Message* msg,
                             std::string* params);
 
 typedef base::hash_map<uint32, LogFunction > LogFunctionMap;
 
 namespace IPC {
 
 class Message;
+class Sender;
 
 // One instance per process.  Needs to be created on the main thread (the UI
 // thread in the browser) but OnPreDispatchMessage/OnPostDispatchMessage
 // can be called on other threads.
 class IPC_EXPORT Logging {
  public:
   // Implemented by consumers of log messages.
   class Consumer {
    public:
     virtual void Log(const LogData& data) = 0;
@@ skipping 76 matching lines @@
   Consumer* consumer_;
 
   static LogFunctionMap* log_function_map_;
 };
 
 }  // namespace IPC
 
 #endif // IPC_MESSAGE_LOG_ENABLED
 
 #endif  // IPC_IPC_LOGGING_H_