Mojo: Remove knowledge of Channel, etc. from ProxyMessagePipeEndpoint.

mojo/system/message_pipe_endpoint.cc

Index: mojo/system/message_pipe_endpoint.cc
diff --git a/mojo/system/message_pipe_endpoint.cc b/mojo/system/message_pipe_endpoint.cc
index a9438361311bafb6cce79f03c86e474c4f944b8d..5c8153a029af76d9c4098fcf525122f62195d7eb 100644
--- a/mojo/system/message_pipe_endpoint.cc
+++ b/mojo/system/message_pipe_endpoint.cc
@@ -48,13 +48,11 @@ void MessagePipeEndpoint::RemoveWaiter(Waiter* /*waiter*/,
     *signals_state = HandleSignalsState();
 }
 
-void MessagePipeEndpoint::Attach(ChannelEndpoint* /*channel_endpoint*/,
-                                 Channel* /*channel*/,
-                                 MessageInTransit::EndpointId /*local_id*/) {
+void MessagePipeEndpoint::Attach(ChannelEndpoint* /*channel_endpoint*/) {
   NOTREACHED();
 }
 
-bool MessagePipeEndpoint::Run(MessageInTransit::EndpointId /*remote_id*/) {
+bool MessagePipeEndpoint::Run() {
   NOTREACHED();
   return true;
 }