Remove remaining calls to deprecated MessageLoop methods.

content/renderer/media/media_stream_audio_processor.cc

 // Copyright 2013 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/media_stream_audio_processor.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/trace_event/trace_event.h"
 #include "build/build_config.h"
 #include "content/public/common/content_switches.h"
 #include "content/renderer/media/media_stream_audio_processor_options.h"
 #include "content/renderer/media/webrtc_audio_device_impl.h"
 #include "media/base/audio_converter.h"
 #include "media/base/audio_fifo.h"
 #include "media/base/audio_parameters.h"
 #include "media/base/channel_layout.h"
@@ skipping 730 matching lines @@
   DCHECK_EQ(err, 0) << "ProcessStream() error: " << err;
 
   if (typing_detector_) {
     webrtc::VoiceDetection* vad = ap->voice_detection();
     DCHECK(vad->is_enabled());
     bool detected = typing_detector_->Process(key_pressed,
                                               vad->stream_has_voice());
     base::subtle::Release_Store(&typing_detected_, detected);
   }
 
-  main_thread_message_loop_->PostTask(
+  main_thread_message_loop_->task_runner()->PostTask(
       FROM_HERE, base::Bind(&MediaStreamAudioProcessor::UpdateAecStats, this));
 
   // Return 0 if the volume hasn't been changed, and otherwise the new volume.
   return (agc->stream_analog_level() == volume) ?
       0 : agc->stream_analog_level();
 }
 
 void MediaStreamAudioProcessor::UpdateAecStats() {
   DCHECK(main_thread_checker_.CalledOnValidThread());
   if (echo_information_)
     echo_information_->UpdateAecStats(audio_processing_->echo_cancellation());
 }
 
 }  // namespace content