Remove deprecated functions in rtp_rtcp module

webrtc/modules/rtp_rtcp/source/rtp_utility.h

Index: webrtc/modules/rtp_rtcp/source/rtp_utility.h
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_utility.h b/webrtc/modules/rtp_rtcp/source/rtp_utility.h
index 1a24285395225f92f287076a25da36f2d2410e99..474bc6e04e00c9ac66121f4d5628af9ca022c8b0 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_utility.h
+++ b/webrtc/modules/rtp_rtcp/source/rtp_utility.h
@@ -52,11 +52,6 @@ class RtpHeaderParser {
   bool ParseRtcp(RTPHeader* header) const;
   bool Parse(RTPHeader* parsedPacket,
              RtpHeaderExtensionMap* ptrExtensionMap = nullptr) const;
-  RTC_DEPRECATED bool Parse(
-      RTPHeader& parsedPacket,  // NOLINT(runtime/references)
-      RtpHeaderExtensionMap* ptrExtensionMap = nullptr) const {
-    return Parse(&parsedPacket, ptrExtensionMap);
-  }
 
  private:
   void ParseOneByteExtensionHeader(RTPHeader* parsedPacket,