Update smoothed bitrate.

webrtc/modules/audio_coding/codecs/cng/audio_encoder_cng.cc

Index: webrtc/modules/audio_coding/codecs/cng/audio_encoder_cng.cc
diff --git a/webrtc/modules/audio_coding/codecs/cng/audio_encoder_cng.cc b/webrtc/modules/audio_coding/codecs/cng/audio_encoder_cng.cc
index 1beebd522dadf361c540b0a2aa6e0b5a450eb9e8..0de6946c0f0e3348c5b50a164a91955ebf1e69e0 100644
--- a/webrtc/modules/audio_coding/codecs/cng/audio_encoder_cng.cc
+++ b/webrtc/modules/audio_coding/codecs/cng/audio_encoder_cng.cc
@@ -191,8 +191,10 @@ void AudioEncoderCng::OnReceivedUplinkPacketLossFraction(
 }
 
 void AudioEncoderCng::OnReceivedTargetAudioBitrate(
-    int target_audio_bitrate_bps) {
-  speech_encoder_->OnReceivedTargetAudioBitrate(target_audio_bitrate_bps);
+    int target_audio_bitrate_bps,
+    rtc::Optional<int64_t> probing_interval_ms) {
+  speech_encoder_->OnReceivedTargetAudioBitrate(target_audio_bitrate_bps,
+                                                probing_interval_ms);
 }
 
 AudioEncoder::EncodedInfo AudioEncoderCng::EncodePassive(