Separate out IPC::Message::Sender and channel::Listener into a separate class.

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_
 #pragma once
 
 #include "ipc/ipc_message.h"  // For IPC_MESSAGE_LOG_ENABLED.
 
@@ skipping 41 matching lines @@
   // Enable and Disable are NOT cross-process; they only affect the
   // current thread/process.  If you want to modify the value for all
   // processes, perhaps your intent is to call
   // g_browser_process->SetIPCLoggingEnabled().
   void Enable();
   void Disable();
   bool Enabled() const { return enabled_; }
 
   // Called by child processes to give the logger object the channel to send
   // logging data to the browser process.
-  void SetIPCSender(Message::Sender* sender);
+  void SetIPCSender(Sender* sender);
 
   // Called in the browser process when logging data from a child process is
   // received.
   void OnReceivedLoggingMessage(const Message& message);
 
   void OnSendMessage(Message* message, const std::string& channel_id);
   void OnPreDispatchMessage(const Message& message);
   void OnPostDispatchMessage(const Message& message,
                              const std::string& channel_id);
 
@@ skipping 32 matching lines @@
   void OnSendLogs();
   void Log(const LogData& data);
 
   bool enabled_;
   bool enabled_on_stderr_;  // only used on POSIX for now
   bool enabled_color_; // only used on POSIX for now
 
   std::vector<LogData> queued_logs_;
   bool queue_invoke_later_pending_;
 
-  Message::Sender* sender_;
+  Sender* sender_;
   MessageLoop* main_thread_;
 
   Consumer* consumer_;
 
   static LogFunctionMap* log_function_map_;
 };
 
 }  // namespace IPC
 
 #endif // IPC_MESSAGE_LOG_ENABLED
 
 #endif  // IPC_IPC_LOGGING_H_