Delete support for sending RTCP RPSI and SLI messages.

webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h

Index: webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
index f286b5e6eee78c5c9866143207adfc61b2ba8600..dfb31c4661b04e776dfa2318e15f030909fd6187 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
+++ b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
@@ -269,8 +269,6 @@ class ModuleRtpRtcpImpl : public RtpRtcp, public RTCPReceiver::ModuleRtpRtcp {
 
   // Video part.
 
-  int32_t SendRTCPSliceLossIndication(uint8_t picture_id) override;
-
   // Set method for requesting a new key frame.
   int32_t SetKeyFrameRequestMethod(KeyFrameRequestMethod method) override;
 
@@ -293,9 +291,6 @@ class ModuleRtpRtcpImpl : public RtpRtcp, public RTCPReceiver::ModuleRtpRtcp {
                    uint32_t* fec_rate,
                    uint32_t* nackRate) const override;
 
-  // Good state of RTP receiver inform sender.
-  int32_t SendRTCPReferencePictureSelection(uint64_t picture_id) override;
-
   void RegisterSendChannelRtpStatisticsCallback(
       StreamDataCountersCallback* callback) override;
   StreamDataCountersCallback* GetSendChannelRtpStatisticsCallback()