Update from https://crrev.com/316786

net/quic/quic_unacked_packet_map.cc

 // Copyright 2014 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.
 
 #include "net/quic/quic_unacked_packet_map.h"
 
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "net/quic/quic_connection_stats.h"
 #include "net/quic/quic_utils_chromium.h"
@@ skipping 35 matching lines @@
   DCHECK_GE(sequence_number, least_unacked_ + unacked_packets_.size());
   while (least_unacked_ + unacked_packets_.size() < sequence_number) {
     unacked_packets_.push_back(TransmissionInfo());
     unacked_packets_.back().is_unackable = true;
   }
 
   TransmissionInfo info(packet.retransmittable_frames,
                         packet.sequence_number_length,
                         transmission_type,
                         sent_time);
-  DCHECK(packet.packet != nullptr);
-  info.is_fec_packet = packet.packet->is_fec_packet();
+  info.is_fec_packet = packet.is_fec_packet;
 
   if (old_sequence_number == 0) {
     if (packet.retransmittable_frames != nullptr &&
         packet.retransmittable_frames->HasCryptoHandshake() == IS_HANDSHAKE) {
       ++pending_crypto_packet_count_;
     }
   } else {
     TransferRetransmissionInfo(
         old_sequence_number, sequence_number, transmission_type, &info);
   }
@@ skipping 333 matching lines @@
   TransmissionInfo* info = &unacked_packets_[sequence_number - least_unacked_];
   DCHECK(!info->in_flight);
   DCHECK_NE(0u, info->bytes_sent);
   DCHECK(info->sent_time.IsInitialized());
 
   bytes_in_flight_ += info->bytes_sent;
   info->in_flight = true;
 }
 
 }  // namespace net