Remove all remaining traces of MessageLoopProxy.

extensions/renderer/api/display_source/wifi_display/wifi_display_media_manager.cc

 // Copyright 2016 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 "extensions/renderer/api/display_source/wifi_display/wifi_display_media_manager.h"
 
 #include "base/logging.h"
 #include "base/rand_util.h"
 #include "base/task_runner_util.h"
 #include "content/public/common/service_registry.h"
@@ skipping 70 matching lines @@
   content::VideoCaptureDeliverFrameCB callback_;
   DISALLOW_COPY_AND_ASSIGN(WiFiDisplayVideoSink);
 };
 
 WiFiDisplayMediaManager::WiFiDisplayMediaManager(
     const blink::WebMediaStreamTrack& video_track,
     const blink::WebMediaStreamTrack& audio_track,
     const std::string& sink_ip_address,
     content::ServiceRegistry* service_registry,
     const ErrorCallback& error_callback)
-  : video_track_(video_track),
-    audio_track_(audio_track),
-    service_registry_(service_registry),
-    sink_ip_address_(sink_ip_address),
-    player_(nullptr),
-    io_task_runner_(content::RenderThread::Get()->GetIOMessageLoopProxy()),
-    error_callback_(error_callback),
-    is_playing_(false),
-    is_initialized_(false),
-    weak_factory_(this) {
+    : video_track_(video_track),
+      audio_track_(audio_track),
+      service_registry_(service_registry),
+      sink_ip_address_(sink_ip_address),
+      player_(nullptr),
+      io_task_runner_(content::RenderThread::Get()->GetIOTaskRunner()),
+      error_callback_(error_callback),
+      is_playing_(false),
+      is_initialized_(false),
+      weak_factory_(this) {
   DCHECK(!video_track.isNull() || !audio_track.isNull());
   DCHECK(service_registry_);
   DCHECK(!error_callback_.is_null());
 }
 
 WiFiDisplayMediaManager::~WiFiDisplayMediaManager() {
   Teardown();
 }
 
 void WiFiDisplayMediaManager::Play() {
@@ skipping 374 matching lines @@
       media::BindToCurrentLoop(on_completed));
 }
 
 void WiFiDisplayMediaManager::ConnectToRemoteService(
     WiFiDisplayMediaServiceRequest request) {
   DCHECK(content::RenderThread::Get());
   service_registry_->ConnectToRemoteService(std::move(request));
 }
 
 }  // namespace extensions