Update from chromium https://crrev.com/302282

net/quic/congestion_control/pacing_sender.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // A send algorithm which adds pacing on top of an another send algorithm.
 // It uses the underlying sender's bandwidth estimate to determine the
 // pacing rate to be used.  It also takes into consideration the expected
 // resolution of the underlying alarm mechanism to ensure that alarms are
 // not set too aggressively, and to smooth out variations.
 
@@ skipping 19 matching lines @@
   // not expect a callback before that time delta.  |initial_packet_burst| is
   // the number of packets sent without pacing after quiescence.
   PacingSender(SendAlgorithmInterface* sender,
                QuicTime::Delta alarm_granularity,
                uint32 initial_packet_burst);
   ~PacingSender() override;
 
   // SendAlgorithmInterface methods.
   void SetFromConfig(const QuicConfig& config, bool is_server) override;
   void SetNumEmulatedConnections(int num_connections) override;
-  void OnIncomingQuicCongestionFeedbackFrame(
-      const QuicCongestionFeedbackFrame& feedback,
-      QuicTime feedback_receive_time) override;
   void OnCongestionEvent(bool rtt_updated,
                          QuicByteCount bytes_in_flight,
                          const CongestionVector& acked_packets,
                          const CongestionVector& lost_packets) override;
   bool OnPacketSent(QuicTime sent_time,
                     QuicByteCount bytes_in_flight,
                     QuicPacketSequenceNumber sequence_number,
                     QuicByteCount bytes,
                     HasRetransmittableData is_retransmittable) override;
   void OnRetransmissionTimeout(bool packets_retransmitted) override;
@@ skipping 21 matching lines @@
   QuicTime last_delayed_packet_sent_time_;
   QuicTime next_packet_send_time_;  // When can the next packet be sent.
   mutable bool was_last_send_delayed_;  // True when the last send was delayed.
 
   DISALLOW_COPY_AND_ASSIGN(PacingSender);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CONGESTION_CONTROL_PACING_SENDER_H_