Update smoothed bitrate.

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 1d67f689a7ac41160130715f79e08ae237a12e59..28a2cc21edc9fda4c9692d9ea00eccee762e65bd 100644
--- a/webrtc/voice_engine/channel_proxy.cc
+++ b/webrtc/voice_engine/channel_proxy.cc
@@ -249,6 +249,11 @@ void ChannelProxy::DisassociateSendChannel() {
   channel()->set_associate_send_channel(ChannelOwner(nullptr));
 }
 
+void ChannelProxy::AdaptCodec() {
+  // May be called on either worker thread or network thread.
+  channel()->AdaptCodec();
+}
+
 Channel* ChannelProxy::channel() const {
   RTC_DCHECK(channel_owner_.channel());
   return channel_owner_.channel();