Remove deprecated functions in rtp_rtcp module

webrtc/modules/rtp_rtcp/include/rtp_payload_registry.h

Index: webrtc/modules/rtp_rtcp/include/rtp_payload_registry.h
diff --git a/webrtc/modules/rtp_rtcp/include/rtp_payload_registry.h b/webrtc/modules/rtp_rtcp/include/rtp_payload_registry.h
index 6ce643496d0105179869b31fa2b1f4ea43a523d7..4e2d2a26a4af78a233c472fc5924997dff463cba 100644
--- a/webrtc/modules/rtp_rtcp/include/rtp_payload_registry.h
+++ b/webrtc/modules/rtp_rtcp/include/rtp_payload_registry.h
@@ -86,15 +86,6 @@ class RTPPayloadRegistry {
 
   bool IsRtx(const RTPHeader& header) const;
 
-  // DEPRECATED. Use RestoreOriginalPacket below that takes a uint8_t*
-  // restored_packet, instead of a uint8_t**.
-  // TODO(noahric): Remove this when all callers have been updated.
-  bool RestoreOriginalPacket(uint8_t** restored_packet,
-                             const uint8_t* packet,
-                             size_t* packet_length,
-                             uint32_t original_ssrc,
-                             const RTPHeader& header) const;
-
   bool RestoreOriginalPacket(uint8_t* restored_packet,
                              const uint8_t* packet,
                              size_t* packet_length,
@@ -111,15 +102,6 @@ class RTPPayloadRegistry {
 
   int GetPayloadTypeFrequency(uint8_t payload_type) const;
 
-  // DEPRECATED. Use PayloadTypeToPayload below that returns const Payload*
-  // instead of taking output parameter.
-  // TODO(danilchap): Remove this when all callers have been updated.
-  bool PayloadTypeToPayload(const uint8_t payload_type,
-                            RtpUtility::Payload*& payload) const {  // NOLINT
-    payload =
-        const_cast<RtpUtility::Payload*>(PayloadTypeToPayload(payload_type));
-    return payload != nullptr;
-  }
   const RtpUtility::Payload* PayloadTypeToPayload(uint8_t payload_type) const;
 
   void ResetLastReceivedPayloadTypes() {