Initial implementation of RtpTransportControllerReceive and related interfaces.

webrtc/audio/audio_receive_stream.cc

Index: webrtc/audio/audio_receive_stream.cc
diff --git a/webrtc/audio/audio_receive_stream.cc b/webrtc/audio/audio_receive_stream.cc
index b7ea047a79b3599f848a54b2c16b5d7b845332d5..df1bb3b569bf439be8b59b17605bc942ef9d8308 100644
--- a/webrtc/audio/audio_receive_stream.cc
+++ b/webrtc/audio/audio_receive_stream.cc
@@ -97,15 +97,6 @@ AudioReceiveStream::AudioReceiveStream(
   channel_proxy_->RegisterExternalTransport(config.rtcp_send_transport);
   channel_proxy_->SetReceiveCodecs(config.decoder_map);
 
-  for (const auto& extension : config.rtp.extensions) {
-    if (extension.uri == RtpExtension::kAudioLevelUri) {
-      channel_proxy_->SetReceiveAudioLevelIndicationStatus(true, extension.id);
-    } else if (extension.uri == RtpExtension::kTransportSequenceNumberUri) {
-      channel_proxy_->EnableReceiveTransportSequenceNumber(extension.id);
-    } else {
-      RTC_NOTREACHED() << "Unsupported RTP extension.";
-    }
-  }
   // Configure bandwidth estimation.
   channel_proxy_->RegisterReceiverCongestionControlObjects(packet_router);