Pending tasks in a message loop should be deleted before shutting down Blink

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 831c982222041e397a102ccd467e7b61e90d244a..28e5943691bc0ad186b51d0d86b5bc148d4b66fb 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -121,6 +121,8 @@ class CONTENT_EXPORT RenderThreadImpl : public RenderThread,
   RenderThreadImpl();
   // Constructor that's used when running in single process mode.
   explicit RenderThreadImpl(const std::string& channel_name);
+  // Constructor that's used in RendererMain.
+  explicit RenderThreadImpl(scoped_ptr<base::MessageLoop> main_message_loop);
   ~RenderThreadImpl() override;
   void Shutdown() override;
 
@@ -525,6 +527,11 @@ class CONTENT_EXPORT RenderThreadImpl : public RenderThread,
   // GpuChannelHostFactory methods.
   scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
 
+  // The message loop of the renderer main thread.
+  // This message loop should be destructed before the RenderThreadImpl
+  // shuts down Blink.
+  scoped_ptr<base::MessageLoop> main_message_loop_;
+
   // A lazily initiated thread on which file operations are run.
   scoped_ptr<base::Thread> file_thread_;