Removed extended jitter report from RtcpSender.

This was never used (value always 0, when sent)

BUG=2450
R=asapersson@webrtc.org

Review URL: https://codereview.webrtc.org/1208843003 .

Cr-Commit-Position: refs/heads/master@{#9631}

webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc

@@ -650,15 +650,6 @@ void ModuleRtpRtcpImpl::SetREMBData(const uint32_t bitrate,
   rtcp_sender_.SetREMBData(bitrate, ssrcs);
 }
 
-// (IJ) Extended jitter report.
-bool ModuleRtpRtcpImpl::IJ() const {
-  return rtcp_sender_.IJ();
-}
-
-void ModuleRtpRtcpImpl::SetIJStatus(const bool enable) {
-  rtcp_sender_.SetIJStatus(enable);
-}
-
 int32_t ModuleRtpRtcpImpl::RegisterSendRtpHeaderExtension(
     const RTPExtensionType type,
     const uint8_t id) {