Minor change to QUIC's retransmission to not link old retransmissions

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 6238079fa8ab84b889df9ba1358c5119f8cf9c28..ee75dd70b42e74e9f0326cd8e6c4dcca2b57e3e5 100644
--- a/net/quic/quic_protocol.h
+++ b/net/quic/quic_protocol.h
@@ -144,18 +144,14 @@ enum TransmissionType {
   NOT_RETRANSMISSION,
   FIRST_TRANSMISSION_TYPE = NOT_RETRANSMISSION,
   HANDSHAKE_RETRANSMISSION,  // Retransmits due to handshake timeouts.
-  ALL_UNACKED_RETRANSMISSION,  // Retransmits of all unacked packets.
+  ALL_UNACKED_RETRANSMISSION,  // Retransmits all unacked packets.
+  ALL_INITIAL_RETRANSMISSION,  // Retransmits all initially encrypted packets.
   LOSS_RETRANSMISSION,  // Retransmits due to loss detection.
   RTO_RETRANSMISSION,  // Retransmits due to retransmit time out.
   TLP_RETRANSMISSION,  // Tail loss probes.
   LAST_TRANSMISSION_TYPE = TLP_RETRANSMISSION,
 };
 
-enum RetransmissionType {
-  INITIAL_ENCRYPTION_ONLY,
-  ALL_PACKETS
-};
-
 enum HasRetransmittableData {
   NO_RETRANSMITTABLE_DATA,
   HAS_RETRANSMITTABLE_DATA,
@@ -1076,6 +1072,8 @@ struct NET_EXPORT_PRIVATE TransmissionInfo {
   SequenceNumberList* 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;
 };
 
 }  // namespace net