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

webrtc/modules/audio_coding/acm2/audio_coding_module.cc

Index: webrtc/modules/audio_coding/acm2/audio_coding_module.cc
diff --git a/webrtc/modules/audio_coding/acm2/audio_coding_module.cc b/webrtc/modules/audio_coding/acm2/audio_coding_module.cc
index daeea3577e23a854d26f9b702c6d84f1c5ec989d..cbd3cbc0158d8d3c690a7a48d1f7f419675ef7d6 100644
--- a/webrtc/modules/audio_coding/acm2/audio_coding_module.cc
+++ b/webrtc/modules/audio_coding/acm2/audio_coding_module.cc
@@ -901,7 +901,8 @@ int AudioCodingModuleImpl::SetCodecFEC(bool enable_codec_fec) {
 int AudioCodingModuleImpl::SetPacketLossRate(int loss_rate) {
   rtc::CritScope lock(&acm_crit_sect_);
   if (HaveValidEncoder("SetPacketLossRate")) {
-    encoder_stack_->OnReceivedUplinkPacketLossFraction(loss_rate / 100.0);
+    encoder_stack_->OnReceivedUplinkPacketLossFraction(
+        rtc::Optional<float>(loss_rate / 100.0f));
   }
   return 0;
 }