Simplify QuicUnackedPacketMap's RemovePreviousTransmissions by always

net/quic/quic_unacked_packet_map.cc

Index: net/quic/quic_unacked_packet_map.cc
diff --git a/net/quic/quic_unacked_packet_map.cc b/net/quic/quic_unacked_packet_map.cc
index 85074dfce46012056fbb193038c85b312fdd3682..2f971ee5c302331dd7d5ed36206b509d4d931d6f 100644
--- a/net/quic/quic_unacked_packet_map.cc
+++ b/net/quic/quic_unacked_packet_map.cc
@@ -107,8 +107,8 @@ void QuicUnackedPacketMap::OnRetransmittedPacket(
                        transmission_info->all_transmissions));
 }
 
-void QuicUnackedPacketMap::ClearPreviousRetransmissions(size_t num_to_clear) {
-  while (!unacked_packets_.empty() && num_to_clear > 0) {
+void QuicUnackedPacketMap::ClearAllPreviousRetransmissions() {
+  while (!unacked_packets_.empty() && least_unacked_ < largest_observed_) {
     // If this packet is in flight, or has retransmittable data, then there is
     // no point in clearing out any further packets, because they would not
     // affect the high water mark.
@@ -137,7 +137,6 @@ void QuicUnackedPacketMap::ClearPreviousRetransmissions(size_t num_to_clear) {
     }
     unacked_packets_.pop_front();
     ++least_unacked_;
-    --num_to_clear;
   }
 }