Delete support for sending RTCP RPSI and SLI messages.

webrtc/modules/rtp_rtcp/include/rtp_rtcp.h

Index: webrtc/modules/rtp_rtcp/include/rtp_rtcp.h
diff --git a/webrtc/modules/rtp_rtcp/include/rtp_rtcp.h b/webrtc/modules/rtp_rtcp/include/rtp_rtcp.h
index 186e135b346b98033a83162447f82ff906097e9b..10c947bd845a1080e58f8a52c0b2bcdb17045d45 100644
--- a/webrtc/modules/rtp_rtcp/include/rtp_rtcp.h
+++ b/webrtc/modules/rtp_rtcp/include/rtp_rtcp.h
@@ -313,13 +313,6 @@ class RtpRtcp : public Module {
   virtual int32_t SendCompoundRTCP(
       const std::set<RTCPPacketType>& rtcp_packet_types) = 0;
 
-  // Notifies the sender about good state of the RTP receiver.
-  virtual int32_t SendRTCPReferencePictureSelection(uint64_t picture_id) = 0;
-
-  // Send a RTCP Slice Loss Indication (SLI).
-  //   |picture_id| - 6 least significant bits of picture_id.
-  virtual int32_t SendRTCPSliceLossIndication(uint8_t picture_id) = 0;
-
   // Returns statistics of the amount of data sent.
   // Returns -1 on failure else 0.
   virtual int32_t DataCountersRTP(size_t* bytes_sent,