relnote: Reduce the size of QUIC's TransmissionInfo struct based on

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 24 matching lines @@
                      QuicPacketNumber old_packet_number,
                      TransmissionType transmission_type,
                      QuicTime sent_time,
                      QuicByteCount bytes_sent,
                      bool set_in_flight);
 
   // Returns true if the packet |packet_number| is unacked.
   bool IsUnacked(QuicPacketNumber packet_number) const;
 
   // Sets the nack count to the max of the current nack count and |min_nacks|.
-  void NackPacket(QuicPacketNumber packet_number, QuicPacketCount min_nacks);
+  void NackPacket(QuicPacketNumber packet_number, uint16 min_nacks);
 
   // Marks |packet_number| as no longer in flight.
   void RemoveFromInFlight(QuicPacketNumber packet_number);
 
   // No longer retransmit data for |stream_id|.
   void CancelRetransmissionsForStream(QuicStreamId stream_id);
 
   // Returns true if the unacked packet |packet_number| has retransmittable
   // frames.  This will return false if the packet has been acked, if a
   // previous transmission of this packet was ACK'd, or if this packet has been
@@ skipping 122 matching lines @@
   // Notifier manager for ACK packets.  We notify it every time we abandon a
   // packet.
   AckNotifierManager* ack_notifier_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicUnackedPacketMap);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_UNACKED_PACKET_MAP_H_