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

mojo/public/java/system/src/org/chromium/mojo/system/UntypedHandle.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.system;
-
-import org.chromium.mojo.system.DataPipe.ConsumerHandle;
-import org.chromium.mojo.system.DataPipe.ProducerHandle;
-
-/**
- * A mojo handle of unknown type. This handle can be typed by using one of its methods, which will
- * return a handle of the requested type and invalidate this object. No validation is made when the
- * conversion operation is called.
- */
-public interface UntypedHandle extends Handle {
-
-    /**
-     * @see org.chromium.mojo.system.Handle#pass()
-     */
-    @Override
-    public UntypedHandle pass();
-
-    /**
-     * Returns the underlying handle, as a {@link MessagePipeHandle}, invalidating this
-     * representation.
-     */
-    public MessagePipeHandle toMessagePipeHandle();
-
-    /**
-     * Returns the underlying handle, as a {@link ConsumerHandle}, invalidating this representation.
-     */
-    public ConsumerHandle toDataPipeConsumerHandle();
-
-    /**
-     * Returns the underlying handle, as a {@link ProducerHandle}, invalidating this representation.
-     */
-    public ProducerHandle toDataPipeProducerHandle();
-
-    /**
-     * Returns the underlying handle, as a {@link SharedBufferHandle}, invalidating this
-     * representation.
-     */
-    public SharedBufferHandle toSharedBufferHandle();
-
-}