Remove RTPSenderVideo::FecPacketOverhead() since it is unused.

webrtc/modules/rtp_rtcp/source/rtp_sender_video.h

Index: webrtc/modules/rtp_rtcp/source/rtp_sender_video.h
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_sender_video.h b/webrtc/modules/rtp_rtcp/source/rtp_sender_video.h
index 23a4082af8ece1fc087fef5514775ad83a22bb79..933eeb04408425dfec014db10ed2b2edad957c15 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_sender_video.h
+++ b/webrtc/modules/rtp_rtcp/source/rtp_sender_video.h
@@ -43,11 +43,6 @@ class RTPSenderVideo {
 
   virtual RtpVideoCodecTypes VideoCodecType() const;
 
-  size_t FecPacketOverhead() const {
-    rtc::CritScope cs(&crit_);
-    return CalculateFecPacketOverhead();
-  }
-
   static RtpUtility::Payload* CreateVideoPayload(
       const char payload_name[RTP_PAYLOAD_NAME_SIZE],
       int8_t payload_type);