Delete support for receiving RTCP RPSI and SLI messages.

webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h

Index: webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
diff --git a/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h b/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
index ab9fc401674140a65cdb99066a1de40cfea47e08..7df8a131c6086af36cdb08b9b777188dfdff1601 100644
--- a/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
+++ b/webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h
@@ -15,6 +15,7 @@
 #include <list>
 #include <vector>
 
+#include "webrtc/base/deprecation.h"
 #include "webrtc/common_types.h"
 #include "webrtc/modules/include/module_common_types.h"
 #include "webrtc/system_wrappers/include/clock.h"
@@ -95,8 +96,6 @@ enum RTCPPacketType : uint32_t {
   kRtcpSrReq = 0x0400,
   kRtcpXrVoipMetric = 0x0800,
   kRtcpApp = 0x1000,
-  kRtcpSli = 0x4000,
-  kRtcpRpsi = 0x8000,
   kRtcpRemb = 0x10000,
   kRtcpTransmissionTimeOffset = 0x20000,
   kRtcpXrReceiverReferenceTime = 0x40000,
@@ -222,11 +221,11 @@ class RtcpIntraFrameObserver {
  public:
   virtual void OnReceivedIntraFrameRequest(uint32_t ssrc) = 0;
 
-  virtual void OnReceivedSLI(uint32_t ssrc,
-                             uint8_t picture_id) = 0;
+  RTC_DEPRECATED virtual void OnReceivedSLI(uint32_t ssrc,
+                             uint8_t picture_id) {}
 
-  virtual void OnReceivedRPSI(uint32_t ssrc,
-                              uint64_t picture_id) = 0;
+  RTC_DEPRECATED virtual void OnReceivedRPSI(uint32_t ssrc,
+                              uint64_t picture_id) {}
 
   virtual ~RtcpIntraFrameObserver() {}
 };