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

net/quic/quic_unacked_packet_map.h

 // 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.
 
 #ifndef NET_QUIC_QUIC_UNACKED_PACKET_MAP_H_
 #define NET_QUIC_QUIC_UNACKED_PACKET_MAP_H_
 
 #include <deque>
 
 #include "net/quic/quic_protocol.h"
@@ skipping 114 matching lines @@
   // |largest_acked_packet| are discarded if they are only for the RTT purposes.
   void IncreaseLargestObserved(QuicPacketSequenceNumber largest_observed);
 
   // Remove any packets no longer needed for retransmission, congestion, or
   // RTT measurement purposes.
   void RemoveObsoletePackets();
 
  private:
   // Called when a packet is retransmitted with a new sequence number.
   // |old_sequence_number| will remain unacked, but will have no
-  // retransmittable data associated with it. A transmission info will be
-  // created for |new_sequence_number| and returned.
-  TransmissionInfo OnRetransmittedPacket(
-      QuicPacketSequenceNumber old_sequence_number,
-      QuicPacketSequenceNumber new_sequence_number,
-      TransmissionType transmission_type);
+  // retransmittable data associated with it. Retransmittable frames will be
+  // transferred to |info| and all_transmissions will be populated.
+  void TransferRetransmissionInfo(QuicPacketSequenceNumber old_sequence_number,
+                                  QuicPacketSequenceNumber new_sequence_number,
+                                  TransmissionType transmission_type,
+                                  TransmissionInfo* info);
 
   void MaybeRemoveRetransmittableFrames(TransmissionInfo* transmission_info);
 
   // Returns true if the packet no longer has a purpose in the map.
   bool IsPacketUseless(QuicPacketSequenceNumber sequence_number,
                        const TransmissionInfo& info) const;
   // Returns true if the packet is useless or it's only purpose is RTT
   // measurement, and it's old enough that is unlikely to ever happen.
   bool IsPacketRemovable(QuicPacketSequenceNumber sequence_number,
                          const TransmissionInfo& info) const;
@@ skipping 16 matching lines @@
   size_t bytes_in_flight_;
   // Number of retransmittable crypto handshake packets.
   size_t pending_crypto_packet_count_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicUnackedPacketMap);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_UNACKED_PACKET_MAP_H_