Discard acks from QUIC's UnackedPacketMap when the map is larger than

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 c2b6fec8fbc095ee807e5b79ff4169c727816cf3..5f29a2b3c3b9d0434afce257eed1a2a7c30d3c4c 100644
--- a/net/quic/quic_unacked_packet_map.cc
+++ b/net/quic/quic_unacked_packet_map.cc
@@ -13,14 +13,6 @@ using std::max;
 
 namespace net {
 
-namespace {
-
-// Maximum amount of reordering before packets are considered useless for
-// RTT measurement purposes.
-const QuicPacketCount kMaxReorderingForRtt = 200;
-
-}  // anonymous namespace
-
 QuicUnackedPacketMap::QuicUnackedPacketMap()
     : largest_sent_packet_(0),
       largest_observed_(0),
@@ -281,7 +273,7 @@ bool QuicUnackedPacketMap::IsPacketRemovable(
     QuicPacketSequenceNumber sequence_number,
     const TransmissionInfo& info) const {
   return (!IsPacketUsefulForMeasuringRtt(sequence_number, info) ||
-          unacked_packets_.size() > kMaxReorderingForRtt) &&
+          unacked_packets_.size() > kMaxTrackedPackets / 2) &&
          !IsPacketUsefulForCongestionControl(info) &&
          !IsPacketUsefulForRetransmittableData(info);
 }