Mojo: Give ChannelEndpoint the remote ID and ProxyMessagePipeEndpoint the ChannelEndpoint.

mojo/system/message_pipe_endpoint.h

Index: mojo/system/message_pipe_endpoint.h
diff --git a/mojo/system/message_pipe_endpoint.h b/mojo/system/message_pipe_endpoint.h
index 4eb84acd8cdb9b22f0155ed1df7e5f57d255f493..a6bf6f9c27f08fb08e1ad5bb6a93cfbe223e1b53 100644
--- a/mojo/system/message_pipe_endpoint.h
+++ b/mojo/system/message_pipe_endpoint.h
@@ -23,6 +23,7 @@ namespace mojo {
 namespace system {
 
 class Channel;
+class ChannelEndpoint;
 class Waiter;
 
 // This is an interface to one of the ends of a message pipe, and is used by
@@ -74,7 +75,8 @@ class MOJO_SYSTEM_IMPL_EXPORT MessagePipeEndpoint {
   // Implementations must override these if they represent a proxy endpoint. An
   // implementation for a local endpoint needs not override these methods, since
   // they should never be called.
-  virtual void Attach(scoped_refptr<Channel> channel,
+  virtual void Attach(ChannelEndpoint* channel_endpoint,
+                      Channel* channel,
                       MessageInTransit::EndpointId local_id);
   // Returns false if the endpoint should be closed and destroyed, else true.
   virtual bool Run(MessageInTransit::EndpointId remote_id);