Remove GetFeedbackInterval in sender side BWE.

webrtc/modules/congestion_controller/delay_based_bwe.h

 /*
  *  Copyright (c) 2016 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 35 matching lines @@
   virtual ~DelayBasedBwe() {}
 
   Result IncomingPacketFeedbackVector(
       const std::vector<PacketInfo>& packet_feedback_vector);
   void OnRttUpdate(int64_t avg_rtt_ms, int64_t max_rtt_ms);
   bool LatestEstimate(std::vector<uint32_t>* ssrcs,
                       uint32_t* bitrate_bps) const;
   void SetMinBitrate(int min_bitrate_bps);
 
  private:
-  Result IncomingPacketInfo(const PacketInfo& info);
-  // Updates the current remote rate estimate and returns true if a valid
-  // estimate exists.
-  bool UpdateEstimate(int64_t packet_arrival_time_ms,
-                      int64_t now_ms,
-                      uint32_t* target_bitrate_bps);
+  Result IncomingPacketInfo(const PacketInfo& info, int64_t now_ms);
+  // Updates the current remote rate estimate.
+  void UpdateEstimate(int64_t packet_arrival_time_ms, int64_t now_ms);
 
   rtc::ThreadChecker network_thread_;
   Clock* const clock_;
   std::unique_ptr<InterArrival> inter_arrival_;
   std::unique_ptr<OveruseEstimator> estimator_;
   OveruseDetector detector_;
   RateStatistics receiver_incoming_bitrate_;
-  int64_t last_update_ms_;
   int64_t last_seen_packet_ms_;
   bool uma_recorded_;
   AimdRateControl rate_control_;
   ProbeBitrateEstimator probe_bitrate_estimator_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(DelayBasedBwe);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_CONGESTION_CONTROLLER_DELAY_BASED_BWE_H_