Revert "content: Remove use of MessageLoopProxy and deprecated MessageLoop APIs"

content/utility/webthread_impl_for_utility_thread.cc

 // Copyright 2015 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/utility/webthread_impl_for_utility_thread.h"
 
-#include "base/thread_task_runner_handle.h"
-
 namespace content {
 
 WebThreadImplForUtilityThread::WebThreadImplForUtilityThread()
-    : task_runner_(base::ThreadTaskRunnerHandle::Get()),
+    : task_runner_(base::MessageLoopProxy::current()),
       thread_id_(base::PlatformThread::CurrentId()) {
 }
 
 WebThreadImplForUtilityThread::~WebThreadImplForUtilityThread() {
 }
 
 blink::WebScheduler* WebThreadImplForUtilityThread::scheduler() const {
   NOTIMPLEMENTED();
   return nullptr;
 }
 
 blink::PlatformThreadId WebThreadImplForUtilityThread::threadId() const {
   return thread_id_;
 }
 
 base::SingleThreadTaskRunner* WebThreadImplForUtilityThread::TaskRunner()
     const {
   return task_runner_.get();
 }
 
 scheduler::SingleThreadIdleTaskRunner*
 WebThreadImplForUtilityThread::IdleTaskRunner() const {
   NOTIMPLEMENTED();
   return nullptr;
 }
 
 }  // namespace content