WIP: Move the creation of AudioCodecFactory into PeerConnectionFactory.

webrtc/audio_receive_stream.h

Index: webrtc/audio_receive_stream.h
diff --git a/webrtc/audio_receive_stream.h b/webrtc/audio_receive_stream.h
index 6d72b4d3185037e6679faced29c8f0dc326b9627..f4643d45f725af1bfc6d534620e88950b2fd3944 100644
--- a/webrtc/audio_receive_stream.h
+++ b/webrtc/audio_receive_stream.h
@@ -24,6 +24,7 @@
 namespace webrtc {
 
 class AudioDecoder;
+class AudioDecoderFactory;
 class AudioSinkInterface;
 
 // WORK IN PROGRESS
@@ -101,6 +102,8 @@ class AudioReceiveStream {
     // Call::CreateReceiveStream().
     // TODO(solenberg): Use unique_ptr<> once our std lib fully supports C++11.
     std::map<uint8_t, AudioDecoder*> decoder_map;
+
+    std::shared_ptr<AudioDecoderFactory> decoder_factory;
   };
 
   // Starts stream activity.