WebThreadImplForMessageLoop to use blink scheduler

content/child/webthread_impl.h

Index: content/child/webthread_impl.h
diff --git a/content/child/webthread_impl.h b/content/child/webthread_impl.h
index 8ebbd97d02cf62aa57c1b02ac42cc15bdc72ecf3..b63d384c08e7de5c2980140e7f06ab4583075899 100644
--- a/content/child/webthread_impl.h
+++ b/content/child/webthread_impl.h
@@ -57,7 +57,7 @@ class CONTENT_EXPORT WebThreadImpl : public WebThreadBase {
 class WebThreadImplForMessageLoop : public WebThreadBase {
  public:
   CONTENT_EXPORT explicit WebThreadImplForMessageLoop(
-      base::MessageLoopProxy* message_loop);
+      scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner);
   CONTENT_EXPORT virtual ~WebThreadImplForMessageLoop();
 
   virtual void postTask(Task* task) override;
@@ -70,7 +70,7 @@ class WebThreadImplForMessageLoop : public WebThreadBase {
   virtual bool isCurrentThread() const override;
   virtual blink::PlatformThreadId threadId() const override;
 
-  scoped_refptr<base::MessageLoopProxy> message_loop_;
+  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
   blink::PlatformThreadId thread_id_;
 };