Remove all remaining traces of MessageLoopProxy.

chrome/renderer/media/cast_receiver_session.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 "chrome/renderer/media/cast_receiver_session.h"
 
 #include <memory>
 
 #include "base/location.h"
 #include "base/synchronization/waitable_event.h"
@@ skipping 41 matching lines @@
   void StartCapture(const media::VideoCaptureParams& params,
                     const VideoCaptureDeliverFrameCB& frame_callback,
                     const RunningCallback& running_callback) override;
   void StopCapture() override;
  private:
   const scoped_refptr<CastReceiverSession> cast_receiver_session_;
 };
 
 CastReceiverSession::CastReceiverSession()
     : delegate_(new CastReceiverSessionDelegate()),
-      io_task_runner_(
-          content::RenderThread::Get()->GetIOMessageLoopProxy()) {}
+      io_task_runner_(content::RenderThread::Get()->GetIOTaskRunner()) {}
 
 CastReceiverSession::~CastReceiverSession() {
   // We should always be able to delete the object on the IO thread.
   CHECK(io_task_runner_->DeleteSoon(FROM_HERE, delegate_.release()));
 }
 
 void CastReceiverSession::Start(
     const media::cast::FrameReceiverConfig& audio_config,
     const media::cast::FrameReceiverConfig& video_config,
     const net::IPEndPoint& local_endpoint,
@@ skipping 111 matching lines @@
 }
 
 void CastReceiverSession::AudioCapturerSource::SetVolume(double volume) {
   // not supported
 }
 
 void CastReceiverSession::AudioCapturerSource::SetAutomaticGainControl(
     bool enable) {
   // not supported
 }