Remove the MessageLoop::DestructionObserver from mojo bindings.

content/browser/browser_main_loop.cc

 // Copyright (c) 2012 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.
 
 #include "content/browser/browser_main_loop.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 1238 matching lines @@
   // them before |system_monitor_| goes away.
   // On Mac and windows, the monitor needs to be destroyed on the same thread
   // as they were created. On Linux, the monitor will be deleted when IO thread
   // goes away.
 #if defined(OS_WIN)
   system_message_window_.reset();
 #elif defined(OS_MACOSX)
   device_monitor_mac_.reset();
 #endif
 
+  if (BrowserGpuChannelHostFactory::instance()) {
+    BrowserGpuChannelHostFactory::instance()->CloseChannel();
+  }
+
   // Shutdown the Service Manager and IPC.
   service_manager_context_.reset();
   mojo_ipc_support_.reset();
 
   // Must be size_t so we can subtract from it.
   for (size_t thread_id = BrowserThread::ID_COUNT - 1;
        thread_id >= (BrowserThread::UI + 1);
        --thread_id) {
     // Find the thread object we want to stop. Looping over all valid
     // BrowserThread IDs and DCHECKing on a missing case in the switch
@@ skipping 517 matching lines @@
   if (!audio_manager_) {
     audio_thread_ = base::MakeUnique<AudioManagerThread>();
     audio_manager_ = media::AudioManager::Create(
         audio_thread_->task_runner(), audio_thread_->worker_task_runner(),
         MediaInternals::GetInstance());
   }
   CHECK(audio_manager_);
 }
 
 }  // namespace content