Enable transport seq num extension on receive channel to suppress log warning.

webrtc/voice_engine/channel_proxy.cc

Index: webrtc/voice_engine/channel_proxy.cc
diff --git a/webrtc/voice_engine/channel_proxy.cc b/webrtc/voice_engine/channel_proxy.cc
index f54c81ec47265f0de194c09f60fa390f25679097..7dfab1d8ec34e5008278ee7bc676ca163ba14eac 100644
--- a/webrtc/voice_engine/channel_proxy.cc
+++ b/webrtc/voice_engine/channel_proxy.cc
@@ -62,6 +62,11 @@ void ChannelProxy::EnableSendTransportSequenceNumber(int id) {
   channel()->EnableSendTransportSequenceNumber(id);
 }
 
+void ChannelProxy::EnableReceiveTransportSequenceNumber(int id) {
+  RTC_DCHECK(thread_checker_.CalledOnValidThread());
+  channel()->EnableReceiveTransportSequenceNumber(id);
+}
+
 void ChannelProxy::SetReceiveAbsoluteSenderTimeStatus(bool enable, int id) {
   RTC_DCHECK(thread_checker_.CalledOnValidThread());
   int error = channel()->SetReceiveAbsoluteSenderTimeStatus(enable, id);