OnReceivedUplinkPacketLossFraction() receives [const rtc::Optional<float>&]

webrtc/voice_engine/channel.cc

Index: webrtc/voice_engine/channel.cc
diff --git a/webrtc/voice_engine/channel.cc b/webrtc/voice_engine/channel.cc
index 1d73db6d396a29ab1bc3ca12beee0c8ce1106ae0..0eae821c8655c7f29c4ee3997198004ebc390866 100644
--- a/webrtc/voice_engine/channel.cc
+++ b/webrtc/voice_engine/channel.cc
@@ -1293,7 +1293,8 @@ void Channel::SetBitRate(int bitrate_bps, int64_t probing_interval_ms) {
 void Channel::OnIncomingFractionLoss(int fraction_lost) {
   audio_coding_->ModifyEncoder([&](std::unique_ptr<AudioEncoder>* encoder) {
     if (*encoder)
-      (*encoder)->OnReceivedUplinkPacketLossFraction(fraction_lost / 255.0f);
+      (*encoder)->OnReceivedUplinkPacketLossFraction(
+          rtc::Optional<float>(fraction_lost / 255.0f));
   });
 }