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

net/quic/quic_protocol.h

Index: net/quic/quic_protocol.h
diff --git a/net/quic/quic_protocol.h b/net/quic/quic_protocol.h
index 50c1d441ea5afd92c7929f3763dfc03d6fdab3ba..eb80b7d39b710df8184ede173fcf97aa370d4132 100644
--- a/net/quic/quic_protocol.h
+++ b/net/quic/quic_protocol.h
@@ -51,6 +51,7 @@ typedef std::map<QuicTag, std::string> QuicTagValueMap;
 // TODO(rtenneti): Didn't use SpdyPriority because SpdyPriority is uint8 and
 // QuicPriority is uint32. Use SpdyPriority when we change the QUIC_VERSION.
 typedef uint32 QuicPriority;
+typedef uint16 QuicPacketLength;
 
 // Default initial maximum size in bytes of a QUIC packet.
 const QuicByteCount kDefaultMaxPacketSize = 1350;
@@ -1184,25 +1185,25 @@ struct NET_EXPORT_PRIVATE TransmissionInfo {
                    QuicPacketNumberLength packet_number_length,
                    TransmissionType transmission_type,
                    QuicTime sent_time,
-                   QuicByteCount bytes_sent,
+                   QuicPacketLength bytes_sent,
                    bool is_fec_packet);
 
   RetransmittableFrames* retransmittable_frames;
   QuicPacketNumberLength packet_number_length;
+  QuicPacketLength bytes_sent;
+  uint16 nack_count;
   QuicTime sent_time;
-  QuicByteCount bytes_sent;
-  QuicPacketCount nack_count;
   // Reason why this packet was transmitted.
   TransmissionType transmission_type;
-  // Stores the packet numbers of all transmissions of this packet.
-  // Must always be nullptr or have multiple elements.
-  PacketNumberList* all_transmissions;
   // In flight packets have not been abandoned or lost.
   bool in_flight;
   // True if the packet can never be acked, so it can be removed.
   bool is_unackable;
   // True if the packet is an FEC packet.
   bool is_fec_packet;
+  // Stores the packet numbers of all transmissions of this packet.
+  // Must always be nullptr or have multiple elements.
+  PacketNumberList* all_transmissions;
 };
 
 // Convenience wrapper to wrap an iovec array and the total length, which must