Change VideoSourceInterface::needs_denoising() to return rtc::Optional<bool>

webrtc/api/rtpsender.cc

Index: webrtc/api/rtpsender.cc
diff --git a/webrtc/api/rtpsender.cc b/webrtc/api/rtpsender.cc
index a7537867e26f2bb4104e64f4350d52eb7b6bca3f..94cea6c2c99e47cb27df5043b95193a0552f7665 100644
--- a/webrtc/api/rtpsender.cc
+++ b/webrtc/api/rtpsender.cc
@@ -332,8 +332,7 @@ void VideoRtpSender::SetVideoSend() {
   VideoTrackSourceInterface* source = track_->GetSource();
   if (source) {
     options.is_screencast = rtc::Optional<bool>(source->is_screencast());
-    options.video_noise_reduction =
-        rtc::Optional<bool>(source->needs_denoising());
+    options.video_noise_reduction = source->needs_denoising();
   }
   provider_->SetVideoSend(ssrc_, track_->enabled(), &options);
 }