[rtcp] Fir/Sli/Rpsi updated not to use RTCPUtility

webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h

Index: webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h b/webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h
index dddcdecba69d2b2268f475cb57685901ce7f8256..8707a5dbaf2c29ce29200080826ed6f014a9d271 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h
@@ -22,10 +22,10 @@ namespace rtcp {
 // RFC 4585, Section 6.3.
 class Psfb : public RtcpPacket {
  public:
-  static const uint8_t kPacketType = 206;
+  static constexpr uint8_t kPacketType = 206;
 
   Psfb() : sender_ssrc_(0), media_ssrc_(0) {}
-  virtual ~Psfb() {}
+  ~Psfb() override {}
 
   void From(uint32_t ssrc) { sender_ssrc_ = ssrc; }
   void To(uint32_t ssrc) { media_ssrc_ = ssrc; }
@@ -34,7 +34,7 @@ class Psfb : public RtcpPacket {
   uint32_t media_ssrc() const { return media_ssrc_; }
 
  protected:
-  static const size_t kCommonFeedbackLength = 8;
+  static constexpr size_t kCommonFeedbackLength = 8;
   void ParseCommonFeedback(const uint8_t* payload);
   void CreateCommonFeedback(uint8_t* payload) const;