Introduce AudioDecoderConfig to migrate away from GetAVStream().

media/filters/adaptive_demuxer.cc

 // Copyright (c) 2011 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 "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/string_number_conversions.h"
 #include "base/string_split.h"
 #include "base/string_util.h"
@@ skipping 199 matching lines @@
   }
 
   if (stream)
     stream->Read(base::Bind(&AdaptiveDemuxerStream::OnReadDone, this));
 }
 
 AVStream* AdaptiveDemuxerStream::GetAVStream() {
   return current_stream()->GetAVStream();
 }
 
+const AudioDecoderConfig& AdaptiveDemuxerStream::audio_decoder_config() {
+  return current_stream()->audio_decoder_config();
+}
+
 DemuxerStream::Type AdaptiveDemuxerStream::type() {
   return current_stream()->type();
 }
 
 void AdaptiveDemuxerStream::EnableBitstreamConverter() {
   {
     base::AutoLock auto_lock(lock_);
     bitstream_converter_enabled_ = true;
   }
   current_stream()->EnableBitstreamConverter();
@@ skipping 801 matching lines @@
     delete cb;
     return;
   }
   DemuxerAccumulator* accumulator = new DemuxerAccumulator(
       audio_index, video_index, urls.size(), cb);
   for (size_t i = 0; i < urls.size(); ++i)
     delegate_factory_->Build(urls[i], accumulator->GetNthCallback(i));
 }
 
 }  // namespace media