Remove GetFeedbackInterval in sender side BWE.

webrtc/modules/congestion_controller/delay_based_bwe.h

Index: webrtc/modules/congestion_controller/delay_based_bwe.h
diff --git a/webrtc/modules/congestion_controller/delay_based_bwe.h b/webrtc/modules/congestion_controller/delay_based_bwe.h
index c5be7652324bb7f26c7fbbd5fe5bb21c90684ad2..f8ca1dc2359893d98fd22cf325d26c4512b7e827 100644
--- a/webrtc/modules/congestion_controller/delay_based_bwe.h
+++ b/webrtc/modules/congestion_controller/delay_based_bwe.h
@@ -53,12 +53,9 @@ class DelayBasedBwe {
   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_;
@@ -66,7 +63,6 @@ class DelayBasedBwe {
   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_;