Deprecate FLAGS_quic_reloadable_flag_quic_bbr_ack_spacing2 in the disabled position because it neve…

net/quic/core/congestion_control/bbr_sender.h

 // Copyright 2016 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.
 
 // BBR (Bottleneck Bandwidth and RTT) congestion control algorithm.
 
 #ifndef NET_QUIC_CORE_CONGESTION_CONTROL_BBR_SENDER_H_
 #define NET_QUIC_CORE_CONGESTION_CONTROL_BBR_SENDER_H_
 
 #include <cstdint>
@@ skipping 178 matching lines @@
   // Decides whether to enter or exit PROBE_RTT.
   void MaybeEnterOrExitProbeRtt(QuicTime now,
                                 bool is_round_start,
                                 bool min_rtt_expired);
   // Determines whether BBR needs to enter, exit or advance state of the
   // recovery.
   void UpdateRecoveryState(QuicPacketNumber last_acked_packet,
                            bool has_losses,
                            bool is_round_start);
 
-  // Updates the ack spacing max filter if a larger value is observed.
-  void UpdateAckSpacing(QuicTime ack_time,
-                        QuicPacketNumber largest_newly_acked,
-                        const CongestionVector& acked_packets);
-
   // Updates the ack aggregation max filter in bytes.
   void UpdateAckAggregationBytes(QuicTime ack_time,
                                  QuicByteCount newly_acked_bytes);
 
   // Determines the appropriate pacing rate for the connection.
   void CalculatePacingRate();
   // Determines the appropriate congestion window for the connection.
   void CalculateCongestionWindow(QuicByteCount bytes_acked);
   // Determines the approriate window that constrains the in-flight during
   // recovery.
@@ skipping 15 matching lines @@
   // The packet number of the most recently sent packet.
   QuicPacketNumber last_sent_packet_;
   // Acknowledgement of any packet after |current_round_trip_end_| will cause
   // the round trip counter to advance.
   QuicPacketCount current_round_trip_end_;
 
   // The filter that tracks the maximum bandwidth over the multiple recent
   // round-trips.
   MaxBandwidthFilter max_bandwidth_;
 
-  // Tracks the maximum spacing between two acks acknowledging in order packets.
-  MaxAckDelayFilter max_ack_spacing_;
-
-  // The time the largest acked packet was acked and when it was sent.
-  QuicTime largest_acked_time_;
-  QuicTime largest_acked_sent_time_;
-
   // Tracks the maximum number of bytes acked faster than the sending rate.
   MaxAckHeightFilter max_ack_height_;
 
   // The time this aggregation started and the number of bytes acked during it.
   QuicTime aggregation_epoch_start_time_;
   QuicByteCount aggregation_epoch_bytes_;
 
   // Minimum RTT estimate.  Automatically expires within 10 seconds (and
   // triggers PROBE_RTT mode) if no new value is sampled during that period.
   QuicTime::Delta min_rtt_;
@@ skipping 66 matching lines @@
 
 QUIC_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os,
                                              const BbrSender::Mode& mode);
 QUIC_EXPORT_PRIVATE std::ostream& operator<<(
     std::ostream& os,
     const BbrSender::DebugState& state);
 
 }  // namespace net
 
 #endif  // NET_QUIC_CORE_CONGESTION_CONTROL_BBR_SENDER_H_