Update smoothed bitrate.

webrtc/modules/audio_coding/codecs/audio_encoder.cc

Index: webrtc/modules/audio_coding/codecs/audio_encoder.cc
diff --git a/webrtc/modules/audio_coding/codecs/audio_encoder.cc b/webrtc/modules/audio_coding/codecs/audio_encoder.cc
index 7b7325dc551311f0fcab9c412c7c73aefb033879..18e8f0d3d6a8b18e8ee3560c77144aa8c20b7529 100644
--- a/webrtc/modules/audio_coding/codecs/audio_encoder.cc
+++ b/webrtc/modules/audio_coding/codecs/audio_encoder.cc
@@ -72,12 +72,12 @@ bool AudioEncoder::EnableAudioNetworkAdaptor(const std::string& config_string,
 
 void AudioEncoder::DisableAudioNetworkAdaptor() {}
 
-void AudioEncoder::OnReceivedUplinkBandwidth(int uplink_bandwidth_bps) {}
-
 void AudioEncoder::OnReceivedUplinkPacketLossFraction(
     float uplink_packet_loss_fraction) {}
 
-void AudioEncoder::OnReceivedTargetAudioBitrate(int target_audio_bitrate_bps) {}
+void AudioEncoder::OnReceivedTargetAudioBitrate(
+    int target_audio_bitrate_bps,
+    rtc::Optional<int64_t> probing_interval_ms) {}
 
 void AudioEncoder::OnReceivedRtt(int rtt_ms) {}