Rename IPC Sender and Listener in ppapi, content/public, and content/renderer

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 03d56c38615f6cd1cc30cf55012483df20e1b0a6..7f5a15f54daf555719456a85660a048745e7e1a1 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -411,8 +411,7 @@ scoped_refptr<base::MessageLoopProxy>
   return ChildProcess::current()->io_message_loop_proxy();
 }
 
-void RenderThreadImpl::AddRoute(int32 routing_id,
-                                IPC::Channel::Listener* listener) {
+void RenderThreadImpl::AddRoute(int32 routing_id, IPC::Listener* listener) {
   widget_count_++;
   return ChildThread::AddRoute(routing_id, listener);
 }