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

net/quic/quic_sent_packet_manager.cc

Index: net/quic/quic_sent_packet_manager.cc
diff --git a/net/quic/quic_sent_packet_manager.cc b/net/quic/quic_sent_packet_manager.cc
index e0f49377f4cab2df5fb761b812385eb792679064..1de5dac46e5ba83e16115bb73ed8147396b45bb0 100644
--- a/net/quic/quic_sent_packet_manager.cc
+++ b/net/quic/quic_sent_packet_manager.cc
@@ -310,17 +310,16 @@ bool QuicSentPacketManager::HasRetransmittableFrames(
 }
 
 void QuicSentPacketManager::RetransmitUnackedPackets(
-    RetransmissionType retransmission_type) {
+    TransmissionType retransmission_type) {
+  DCHECK(retransmission_type == ALL_UNACKED_RETRANSMISSION ||
+         retransmission_type == ALL_INITIAL_RETRANSMISSION);
   QuicPacketSequenceNumber sequence_number = unacked_packets_.GetLeastUnacked();
   for (QuicUnackedPacketMap::const_iterator it = unacked_packets_.begin();
        it != unacked_packets_.end(); ++it, ++sequence_number) {
     const RetransmittableFrames* frames = it->retransmittable_frames;
-    // TODO(ianswett): Consider adding a new retransmission type which removes
-    // all these old packets from unacked and retransmits them as new sequence
-    // numbers with no connection to the previous ones.
-    if (frames != NULL && (retransmission_type == ALL_PACKETS ||
+    if (frames != NULL && (retransmission_type == ALL_UNACKED_RETRANSMISSION ||
                            frames->encryption_level() == ENCRYPTION_INITIAL)) {
-      MarkForRetransmission(sequence_number, ALL_UNACKED_RETRANSMISSION);
+      MarkForRetransmission(sequence_number, retransmission_type);
     }
   }
 }