Mojo: Remove ProxyMessagePipeEndpoint::OnRemove(), etc.

mojo/system/message_pipe_endpoint.cc

 // Copyright 2013 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 "mojo/system/message_pipe_endpoint.h"
 
 #include "base/logging.h"
 
 namespace mojo {
 namespace system {
@@ skipping 34 matching lines @@
                                        HandleSignalsState* signals_state) {
   NOTREACHED();
   if (signals_state)
     *signals_state = HandleSignalsState();
 }
 
 void MessagePipeEndpoint::Attach(ChannelEndpoint* /*channel_endpoint*/) {
   NOTREACHED();
 }
 
-void MessagePipeEndpoint::OnRemove() {
-  NOTREACHED();
-}
-
 }  // namespace system
 }  // namespace mojo