[rtp_rtcp] rtcp::Fir cleaned and got Parse function.

webrtc/modules/rtp_rtcp/source/rtcp_sender.cc

Index: webrtc/modules/rtp_rtcp/source/rtcp_sender.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_sender.cc b/webrtc/modules/rtp_rtcp/source/rtcp_sender.cc
index 4b0914d47d290eed663e4c4b37a867a7c209a115..321741eef7ec8b915481bd411c6692649d9a6b16 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_sender.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_sender.cc
@@ -541,8 +541,7 @@ rtc::scoped_ptr<rtcp::RtcpPacket> RTCPSender::BuildFIR(const RtcpContext& ctx) {
 
   rtcp::Fir* fir = new rtcp::Fir();
   fir->From(ssrc_);
-  fir->To(remote_ssrc_);
-  fir->WithCommandSeqNum(sequence_number_fir_);
+  fir->WithRequestTo(remote_ssrc_, sequence_number_fir_);
 
   TRACE_EVENT_INSTANT0(TRACE_DISABLED_BY_DEFAULT("webrtc_rtp"),
                        "RTCPSender::FIR");