Remove calls to deprecated MessageLoop methods in content.

content/renderer/media/webmediaplayer_ms_compositor.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/renderer/media/webmediaplayer_ms_compositor.h"
 
 #include <stdint.h>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 393 matching lines @@
 
   if (!current_frame_used_by_compositor_)
     ++dropped_frame_count_;
   current_frame_used_by_compositor_ = false;
 
   const bool size_changed =
       !current_frame_ ||
       current_frame_->natural_size() != frame->natural_size();
   current_frame_ = frame;
   if (size_changed) {
-    main_message_loop_->PostTask(
+    main_message_loop_->task_runner()->PostTask(
         FROM_HERE, base::Bind(&WebMediaPlayerMS::TriggerResize, player_));
   }
-  main_message_loop_->PostTask(
+  main_message_loop_->task_runner()->PostTask(
       FROM_HERE, base::Bind(&WebMediaPlayerMS::ResetCanvasCache, player_));
 }
 
 void WebMediaPlayerMSCompositor::SetAlgorithmEnabledForTesting(
     bool algorithm_enabled) {
   if (!algorithm_enabled) {
     rendering_frame_buffer_.reset();
     return;
   }
 
   if (!rendering_frame_buffer_) {
     rendering_frame_buffer_.reset(new media::VideoRendererAlgorithm(
         base::Bind(&WebMediaPlayerMSCompositor::MapTimestampsToRenderTimeTicks,
                    base::Unretained(this))));
   }
 }
 
 }  // namespace content