Revert of Revert of Remove the last piece of deprecated synchronous IO code.

media/cast/test/fake_media_source.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 "media/cast/test/fake_media_source.h"
 
 #include "base/files/memory_mapped_file.h"
 #include "base/files/scoped_file.h"
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 129 matching lines @@
         continue;
       }
       if (audio_stream_index_ != -1) {
         LOG(WARNING) << "Found multiple audio streams.";
       }
       audio_stream_index_ = static_cast<int>(i);
       audio_params_.Reset(
           AudioParameters::AUDIO_PCM_LINEAR,
           layout,
           av_codec_context->channels,
-          av_codec_context->channels,
           av_codec_context->sample_rate,
           8 * av_get_bytes_per_sample(av_codec_context->sample_fmt),
           av_codec_context->sample_rate / kAudioPacketsPerSecond);
       LOG(INFO) << "Source file has audio.";
     } else if (av_codec->type == AVMEDIA_TYPE_VIDEO) {
       VideoFrame::Format format =
           PixelFormatToVideoFormat(av_codec_context->pix_fmt);
       if (format != VideoFrame::YV12) {
         LOG(ERROR) << "Cannot handle non YV12 video format: " << format;
         continue;
@@ skipping 425 matching lines @@
 AVCodecContext* FakeMediaSource::av_audio_context() {
   return av_audio_stream()->codec;
 }
 
 AVCodecContext* FakeMediaSource::av_video_context() {
   return av_video_stream()->codec;
 }
 
 }  // namespace cast
 }  // namespace media