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

ipc/ipc_listener.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.

[jam, 2012/06/11 01:56:29]

nit: you don't need this file since you can inline all the methods below (since
there's no return values, clang won't complain)

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ipc/ipc_listener.h"
+
+namespace IPC {
+
+Listener::~Listener() {
+}
+
+void Listener::OnChannelConnected(int32 peer_pid) {
+}
+
+void Listener::OnChannelError() {
+}
+
+#if defined(OS_POSIX)
+void Listener::OnChannelDenied() {
+}
+
+void Listener::OnChannelListenError() {
+}
+#endif
+
+}  // namespace IPC