Landing Recent QUIC Changes.

net/quic/quic_protocol.h

 // Copyright (c) 2012 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_PROTOCOL_H_
 #define NET_QUIC_QUIC_PROTOCOL_H_
 
 #include <stddef.h>
 #include <limits>
 #include <list>
@@ skipping 1053 matching lines @@
   RetransmittableFrames* retransmittable_frames;
   QuicSequenceNumberLength sequence_number_length;
   // Zero when the packet is serialized, non-zero once it's sent.
   QuicTime sent_time;
   // Zero when the packet is serialized, non-zero once it's sent.
   QuicByteCount bytes_sent;
   size_t nack_count;
   // Reason why this packet was transmitted.
   TransmissionType transmission_type;
   // Stores the sequence numbers of all transmissions of this packet.
-  // Can never be null.
+  // Must always be NULL or have multiple elements.
   SequenceNumberList* all_transmissions;
   // In flight packets have not been abandoned or lost.
   bool in_flight;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_PROTOCOL_H_