Make the fuchsia mojo/public repo the source of truth.

mojo/public/java/bindings/src/org/chromium/mojo/bindings/MessageReceiverWithResponder.java

-// Copyright 2014 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.
-
-package org.chromium.mojo.bindings;
-
-/**
- * A {@link MessageReceiver} that can also handle the handle the response message generated from the
- * given message.
- */
-public interface MessageReceiverWithResponder extends MessageReceiver {
-
-    /**
-     * A variant on {@link #accept(Message)} that registers a {@link MessageReceiver}
-     * (known as the responder) to handle the response message generated from the given message. The
-     * responder's {@link #accept(Message)} method may be called as part of the call to
-     * {@link #acceptWithResponder(Message, MessageReceiver)}, or some time after its
-     * return.
-     */
-    boolean acceptWithResponder(Message message, MessageReceiver responder);
-}