Remove MessageInTransit::kTypeMessagePipe; rename kTypeMessagePipeEndpoint to kTypeEndpoint; etc.

mojo/edk/system/message_pipe.h

Index: mojo/edk/system/message_pipe.h
diff --git a/mojo/edk/system/message_pipe.h b/mojo/edk/system/message_pipe.h
index 1c1af1eb474a1c025a0c5ce854600b3ce5b418a2..b91f7b2bdb7b8b077535e80c0dc4cd9f4c429590 100644
--- a/mojo/edk/system/message_pipe.h
+++ b/mojo/edk/system/message_pipe.h
@@ -128,11 +128,6 @@ class MOJO_SYSTEM_IMPL_EXPORT MessagePipe : public ChannelEndpointClient {
       MessageInTransit* message,
       std::vector<DispatcherTransport>* transports);
 
-  // Used by |EnqueueMessage()| to handle control messages that are actually
-  // meant for us.
-  MojoResult HandleControlMessage(unsigned port,
-                                  scoped_ptr<MessageInTransit> message);
-
   base::Lock lock_;  // Protects the following members.
   scoped_ptr<MessagePipeEndpoint> endpoints_[2];