[cleanup] Remove unused fields/functions from rtcp module.

webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h

Index: webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
index 3621f9bdfdcc2965b7f181abd35d360563644aa7..f42d9078584cf0e6b31bd9ace929db3a7467a63c 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
+++ b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
@@ -301,10 +301,6 @@ class ModuleRtpRtcpImpl : public RtpRtcp {
                    uint32_t* fec_rate,
                    uint32_t* nackRate) const override;
 
-  int64_t SendTimeOfSendReport(uint32_t send_report);
-
-  bool SendTimeOfXrRrReport(uint32_t mid_ntp, int64_t* time_ms) const;
-
   // Good state of RTP receiver inform sender.
   int32_t SendRTCPReferencePictureSelection(uint64_t picture_id) override;
 
@@ -313,17 +309,6 @@ class ModuleRtpRtcpImpl : public RtpRtcp {
   StreamDataCountersCallback* GetSendChannelRtpStatisticsCallback()
       const override;
 
-  void OnReceivedTMMBR();
-
-  // Bad state of RTP receiver request a keyframe.
-  void OnRequestIntraFrame();
-
-  // Received a request for a new SLI.
-  void OnReceivedSliceLossIndication(uint8_t picture_id);
-
-  // Received a new reference frame.
-  void OnReceivedReferencePictureSelectionIndication(uint64_t picture_id);
-
   void OnReceivedNACK(const std::list<uint16_t>& nack_sequence_numbers);
 
   void OnRequestSendReport();
@@ -331,11 +316,6 @@ class ModuleRtpRtcpImpl : public RtpRtcp {
  protected:
   bool UpdateRTCPReceiveInformationTimers();
 
-  uint32_t BitrateReceivedNow() const;
-
-  // Get remote SequenceNumber.
-  uint16_t RemoteSequenceNumber() const;
-
   RTPSender rtp_sender_;
 
   RTCPSender rtcp_sender_;
@@ -361,15 +341,11 @@ class ModuleRtpRtcpImpl : public RtpRtcp {
   int64_t last_rtt_process_time_;
   uint16_t packet_overhead_;
 
-  size_t padding_index_;
-
   // Send side
-  NACKMethod nack_method_;
   int64_t nack_last_time_sent_full_;
   uint32_t nack_last_time_sent_full_prev_;
   uint16_t nack_last_seq_number_sent_;
 
-  VideoCodec send_video_codec_;
   KeyFrameRequestMethod key_frame_req_method_;
 
   RemoteBitrateEstimator* remote_bitrate_;