[renderer]: Fix RendererScheduler shutdown logic to ensure it is shutdown before the MessageLoop.

content/renderer/render_thread_impl.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/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
@@ skipping 739 matching lines @@
 
   if (gpu_channel_.get())
     gpu_channel_->DestroyChannel();
 
   // TODO(port)
 #if defined(OS_WIN)
   // Clean up plugin channels before this thread goes away.
   NPChannelBase::CleanupChannels();
 #endif
 
-  // Shut down the message loop before shutting down Blink.
-  // This prevents a scenario where a pending task in the message loop accesses
-  // Blink objects after Blink shuts down.
+  // Shut down the message loop and the renderer scheduler before shutting down
+  // Blink. This prevents a scenario where a pending task in the message loop
+  // accesses Blink objects after Blink shuts down.
   // This must be at the very end of the shutdown sequence. You must not touch
   // the message loop after this.
+  renderer_scheduler_->Shutdown();
   main_message_loop_.reset();
   if (blink_platform_impl_)
     blink::shutdown();
 
   lazy_tls.Pointer()->Set(NULL);
 }
 
 bool RenderThreadImpl::Send(IPC::Message* msg) {
   // Certain synchronous messages cannot always be processed synchronously by
   // the browser, e.g., putting up UI and waiting for the user. This could cause
@@ skipping 1031 matching lines @@
 }
 
 void RenderThreadImpl::PendingRenderFrameConnect::OnConnectionError() {
   size_t erased =
       RenderThreadImpl::current()->pending_render_frame_connects_.erase(
           routing_id_);
   DCHECK_EQ(1u, erased);
 }
 
 }  // namespace content