Remove the MessageLoop::DestructionObserver from mojo bindings.

content/renderer/gpu/compositor_external_begin_frame_source.h

 // 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.
 
 #ifndef CONTENT_RENDERER_GPU_COMPOSITOR_EXTERNAL_BEGIN_FRAME_SOURCE_H_
 #define CONTENT_RENDERER_GPU_COMPOSITOR_EXTERNAL_BEGIN_FRAME_SOURCE_H_
 
 #include <unordered_set>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/threading/non_thread_safe.h"
 #include "cc/scheduler/begin_frame_source.h"
 #include "content/renderer/gpu/compositor_forwarding_message_filter.h"
 
 namespace IPC {
 class Message;
 class SyncMessageFilter;
 }
 
 namespace content {
 
@@ skipping 65 matching lines @@
   scoped_refptr<IPC::SyncMessageFilter> message_sender_;
   int routing_id_;
   CompositorForwardingMessageFilter::Handler begin_frame_source_filter_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(CompositorExternalBeginFrameSource);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_GPU_COMPOSITOR_EXTERNAL_BEGIN_FRAME_SOURCE_H_