Mojo: Add static factory functions to MessagePipe.

mojo/system/message_pipe_dispatcher.cc

Index: mojo/system/message_pipe_dispatcher.cc
diff --git a/mojo/system/message_pipe_dispatcher.cc b/mojo/system/message_pipe_dispatcher.cc
index 3f08fd6658155830711ed4ef46028f7442237d1b..81f0df9548edb03cf4e94f505570ae8862e2c9a4 100644
--- a/mojo/system/message_pipe_dispatcher.cc
+++ b/mojo/system/message_pipe_dispatcher.cc
@@ -84,9 +84,8 @@ Dispatcher::Type MessagePipeDispatcher::GetType() const {
 // static
 std::pair<scoped_refptr<MessagePipeDispatcher>, scoped_refptr<MessagePipe> >
 MessagePipeDispatcher::CreateRemoteMessagePipe() {
-  scoped_refptr<MessagePipe> message_pipe(new MessagePipe(
-      scoped_ptr<MessagePipeEndpoint>(new LocalMessagePipeEndpoint()),
-      scoped_ptr<MessagePipeEndpoint>(new ProxyMessagePipeEndpoint())));
+  scoped_refptr<MessagePipe> message_pipe(
+      new MessagePipe(MessagePipe::LocalProxy()));
   scoped_refptr<MessagePipeDispatcher> dispatcher(
       new MessagePipeDispatcher(MessagePipeDispatcher::kDefaultCreateOptions));
   dispatcher->Init(message_pipe, 0);