Remove the MessageLoop::DestructionObserver from mojo bindings.

content/browser/gpu/browser_gpu_channel_host_factory.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/gpu/browser_gpu_channel_host_factory.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/profiler/scoped_tracker.h"
@@ skipping 180 matching lines @@
     event_.Wait();
   }
   FinishOnMain();
 }
 
 void BrowserGpuChannelHostFactory::EstablishRequest::Cancel() {
   DCHECK(main_task_runner_->BelongsToCurrentThread());
   finished_ = true;
 }
 
+void BrowserGpuChannelHostFactory::CloseChannel() {
+  DCHECK(instance_);
+  if (instance_->gpu_channel_) {
+    instance_->gpu_channel_->DestroyChannel();
+    instance_->gpu_channel_ = nullptr;
+  }
+}
+
 bool BrowserGpuChannelHostFactory::CanUseForTesting() {
   return GpuDataManager::GetInstance()->GpuAccessAllowed(NULL);
 }
 
 void BrowserGpuChannelHostFactory::Initialize(bool establish_gpu_channel) {
   DCHECK(!instance_);
   instance_ = new BrowserGpuChannelHostFactory();
   if (establish_gpu_channel) {
     instance_->EstablishGpuChannel(gpu::GpuChannelEstablishedCallback());
   }
@@ skipping 157 matching lines @@
 }
 
 // static
 void BrowserGpuChannelHostFactory::InitializeShaderDiskCacheOnIO(
     int gpu_client_id,
     const base::FilePath& cache_dir) {
   GetShaderCacheFactorySingleton()->SetCacheInfo(gpu_client_id, cache_dir);
 }
 
 }  // namespace content