[rtp_rtcp] RtcpReceiverTest rewritten using public available interface (observers) instead intermid…

webrtc/modules/rtp_rtcp/source/rtcp_receiver.h

Index: webrtc/modules/rtp_rtcp/source/rtcp_receiver.h
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_receiver.h b/webrtc/modules/rtp_rtcp/source/rtcp_receiver.h
index 24861bd49e6aeb4963c2297b203bbdae4c550648..3c626a9d8134f3a927d064506ee136d1bb1df6f1 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_receiver.h
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_receiver.h
@@ -52,12 +52,7 @@ public:
 
     uint32_t RelaySSRC() const;
 
-    int32_t IncomingRTCPPacket(
-        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation,
-        RTCPUtility::RTCPParserV2 *rtcpParser);
-
-    void TriggerCallbacksFromRTCPPacket(
-        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);
+    bool IncomingPacket(const uint8_t* buffer, size_t length);
 
     // get received cname
     int32_t CNAME(uint32_t remoteSSRC, char cName[RTCP_CNAME_SIZE]) const;
@@ -110,7 +105,14 @@ public:
     void RegisterRtcpStatisticsCallback(RtcpStatisticsCallback* callback);
     RtcpStatisticsCallback* GetRtcpStatisticsCallback();
 
-protected:
+   protected:
+    void IncomingRTCPPacket(
+        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation,
+        RTCPUtility::RTCPParserV2* rtcpParser);
+
+    void TriggerCallbacksFromRTCPPacket(
+        RTCPHelp::RTCPPacketInformation& rtcpPacketInformation);
+
  RTCPUtility::RTCPCnameInformation* CreateCnameInformation(uint32_t remoteSSRC);
  RTCPUtility::RTCPCnameInformation* GetCnameInformation(
      uint32_t remoteSSRC) const;