Update smoothed bitrate.

webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc

Index: webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc
diff --git a/webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc b/webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc
index 51b706490b020eefbbc43d455118c5170fef9ec7..f63857239fcd2c840df5681ab6d945c88a51f682 100644
--- a/webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc
+++ b/webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc
@@ -127,8 +127,10 @@ void AudioEncoderCopyRed::OnReceivedUplinkPacketLossFraction(
 }
 
 void AudioEncoderCopyRed::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);
 }
 
 }  // namespace webrtc