Moved creation of AudioDecoderFactory to inside PeerConnectionFactory.

webrtc/voice_engine/channel_proxy.h

Index: webrtc/voice_engine/channel_proxy.h
diff --git a/webrtc/voice_engine/channel_proxy.h b/webrtc/voice_engine/channel_proxy.h
index df0c3f22ef67cd0c5bf2d2ab34f92cd47c8a7751..8159606ec5c7244f38c1f414e497b4e911d5c3d9 100644
--- a/webrtc/voice_engine/channel_proxy.h
+++ b/webrtc/voice_engine/channel_proxy.h
@@ -80,6 +80,9 @@ class ChannelProxy {
                                  const PacketTime& packet_time);
   virtual bool ReceivedRTCPPacket(const uint8_t* packet, size_t length);
 
+  virtual const rtc::scoped_refptr<AudioDecoderFactory>&
+  GetAudioDecoderFactory() const;
+
  private:
   Channel* channel() const;