Remove use of deprecated MessageLoop methods in ui.

ui/events/test/platform_event_waiter.cc

 // Copyright 2014 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 "ui/events/test/platform_event_waiter.h"
 
-#include "base/message_loop/message_loop.h"
+#include "base/location.h"
+#include "base/single_thread_task_runner.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "ui/events/platform/platform_event_source.h"
 
 namespace ui {
 
 PlatformEventWaiter::PlatformEventWaiter(
     const base::Closure& success_callback,
     const PlatformEventMatcher& event_matcher)
     : success_callback_(success_callback),
       event_matcher_(event_matcher) {
   PlatformEventSource::GetInstance()->AddPlatformEventObserver(this);
 }
 
 PlatformEventWaiter::~PlatformEventWaiter() {
   PlatformEventSource::GetInstance()->RemovePlatformEventObserver(this);
 }
 
 void PlatformEventWaiter::WillProcessEvent(const PlatformEvent& event) {
   if (event_matcher_.Run(event)) {
-    base::MessageLoop::current()->PostTask(FROM_HERE, success_callback_);
+    base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, success_callback_);
     delete this;
   }
 }
 
 void PlatformEventWaiter::DidProcessEvent(const PlatformEvent& event) {
 }
 
 // static
 PlatformEventWaiter* PlatformEventWaiter::Create(
     const base::Closure& success_callback,
     const PlatformEventMatcher& event_matcher) {
   return new PlatformEventWaiter(success_callback, event_matcher);
 }
 
 }  // namespace ui