Remove chain of methods in RtpRtcp module to get current payload frequency for RTCP SRs

webrtc/modules/rtp_rtcp/source/rtcp_sender.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 43 matching lines @@
   uint16_t prevNack_;
   bool consecutive_;
 };
 
 class RTCPSender {
  public:
   struct FeedbackState {
     FeedbackState();
 
     uint8_t send_payload_type;
-    uint32_t frequency_hz;
     uint32_t packets_sent;
     size_t media_bytes_sent;
     uint32_t send_bitrate;
 
     uint32_t last_rr_ntp_secs;
     uint32_t last_rr_ntp_frac;
     uint32_t remote_sr;
 
     bool has_last_xr_rr;
     rtcp::ReceiveTimeInfo last_xr_rr;
@@ skipping 214 matching lines @@
 
   typedef std::unique_ptr<rtcp::RtcpPacket> (RTCPSender::*BuilderFunc)(
       const RtcpContext&);
   std::map<RTCPPacketType, BuilderFunc> builders_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(RTCPSender);
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_SENDER_H_