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

content/public/test/mock_render_process_host.h

Index: content/public/test/mock_render_process_host.h
diff --git a/content/public/test/mock_render_process_host.h b/content/public/test/mock_render_process_host.h
index ca05b22b38df8d7813952d87673d615bcd228ae8..c6f922df90cde7a037de84c5173b17aaa317657c 100644
--- a/content/public/test/mock_render_process_host.h
+++ b/content/public/test/mock_render_process_host.h
@@ -72,10 +72,10 @@ class MockRenderProcessHost : public RenderProcessHost {
   virtual base::TimeDelta GetChildProcessIdleTime() const OVERRIDE;
   virtual void SurfaceUpdated(int32 surface_id) OVERRIDE;
 
-  // IPC::Channel::Sender via RenderProcessHost.
+  // IPC::MessageSender via RenderProcessHost.
   virtual bool Send(IPC::Message* msg) OVERRIDE;
 
-  // IPC::Channel::Listener via RenderProcessHost.
+  // IPC::ChannelListener via RenderProcessHost.
   virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
   virtual void OnChannelConnected(int32 peer_pid) OVERRIDE;