Moved creation of AudioDecoderFactory to inside PeerConnectionFactory.

webrtc/api/peerconnectionfactory.h

Index: webrtc/api/peerconnectionfactory.h
diff --git a/webrtc/api/peerconnectionfactory.h b/webrtc/api/peerconnectionfactory.h
index 0e52efcc966d12a536b8ba9928e28bd707625049..d4bc0da62b97bd9d2d169e5907ceeca2570eef66 100644
--- a/webrtc/api/peerconnectionfactory.h
+++ b/webrtc/api/peerconnectionfactory.h
@@ -101,6 +101,8 @@ class PeerConnectionFactory : public PeerConnectionFactoryInterface {
       rtc::Thread* worker_thread,
       rtc::Thread* signaling_thread,
       AudioDeviceModule* default_adm,
+      const rtc::scoped_refptr<webrtc::AudioDecoderFactory>&
+          audio_decoder_factory,
       cricket::WebRtcVideoEncoderFactory* video_encoder_factory,
       cricket::WebRtcVideoDecoderFactory* video_decoder_factory);
   virtual ~PeerConnectionFactory();
@@ -116,6 +118,7 @@ class PeerConnectionFactory : public PeerConnectionFactoryInterface {
   Options options_;
   // External Audio device used for audio playback.
   rtc::scoped_refptr<AudioDeviceModule> default_adm_;
+  rtc::scoped_refptr<AudioDecoderFactory> audio_decoder_factory_;
   std::unique_ptr<cricket::ChannelManager> channel_manager_;
   // External Video encoder factory. This can be NULL if the client has not
   // injected any. In that case, video engine will use the internal SW encoder.