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

ipc/ipc_message_sender.cc

Index: ipc/ipc_message_sender.cc
diff --git a/ipc/ipc_message_sender.cc b/ipc/ipc_message_sender.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f2bd935f39930bb7bfac10f742952c8ded2eaf28
--- /dev/null
+++ b/ipc/ipc_message_sender.cc
@@ -0,0 +1,12 @@
+// 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.
+
+#include "ipc/ipc_message_sender.h"
+
+namespace IPC {
+
+MessageSender::~MessageSender() {
+}
+
+}  // namespace IPC