Replace QUIC's PathMtuAckListener with a non-AckListener approach. Protected by FLAGS_quic_no_mtu_d…

net/quic/quic_sent_packet_manager.h

 // Copyright 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.
 
 #ifndef NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_
 #define NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 373 matching lines @@
   bool use_new_rto_;
   // If true, cancel pending retransmissions if they're larger than
   // largest_newly_acked.
   bool undo_pending_retransmits_;
 
   // Vectors packets acked and lost as a result of the last congestion event.
   SendAlgorithmInterface::CongestionVector packets_acked_;
   SendAlgorithmInterface::CongestionVector packets_lost_;
   // Largest newly acknowledged packet.
   QuicPacketNumber largest_newly_acked_;
+  // Largest packet in bytes ever acknowledged.
+  QuicPacketLength largest_mtu_acked_;
 
   // Set to true after the crypto handshake has successfully completed. After
   // this is true we no longer use HANDSHAKE_MODE, and further frames sent on
   // the crypto stream (i.e. SCUP messages) are treated like normal
   // retransmittable frames.
   bool handshake_confirmed_;
 
   // Records bandwidth from server to client in normal operation, over periods
   // of time with no loss events.
   QuicSustainedBandwidthRecorder sustained_bandwidth_recorder_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicSentPacketManager);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_