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

ipc/ipc_channel_listener.cc

Index: ipc/ipc_channel_listener.cc
diff --git a/ipc/ipc_channel_listener.cc b/ipc/ipc_channel_listener.cc
new file mode 100644
index 0000000000000000000000000000000000000000..bb2c04d94e3ce48f3fea17ba728aec12f3cfbc45
--- /dev/null
+++ b/ipc/ipc_channel_listener.cc
@@ -0,0 +1,26 @@
+// 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_channel_listener.h"
+
+namespace IPC {
+
+ChannelListener::~ChannelListener() {
+}
+
+void ChannelListener::OnChannelConnected(int32 peer_pid) {
+}
+
+void ChannelListener::OnChannelError() {
+}
+
+#if defined(OS_POSIX)
+void ChannelListener::OnChannelDenied() {
+}
+
+void ChannelListener::OnChannelListenError() {
+}
+#endif
+
+}  // namespace IPC