Delete support for sending RTCP RPSI and SLI messages.

webrtc/video/rtp_stream_receiver.cc

Index: webrtc/video/rtp_stream_receiver.cc
diff --git a/webrtc/video/rtp_stream_receiver.cc b/webrtc/video/rtp_stream_receiver.cc
index b8ef10d549b802de1b963e8e50a3ce4b37bc230b..00f41a29c0bbfc1c0baa54c6f5845086b197a63a 100644
--- a/webrtc/video/rtp_stream_receiver.cc
+++ b/webrtc/video/rtp_stream_receiver.cc
@@ -362,12 +362,6 @@ int32_t RtpStreamReceiver::RequestKeyFrame() {
   return rtp_rtcp_->RequestKeyFrame();
 }
 
-int32_t RtpStreamReceiver::SliceLossIndicationRequest(
-    const uint64_t picture_id) {
-  return rtp_rtcp_->SendRTCPSliceLossIndication(
-      static_cast<uint8_t>(picture_id));
-}
-
 bool RtpStreamReceiver::IsUlpfecEnabled() const {
   return config_.rtp.ulpfec.ulpfec_payload_type != -1;
 }