Deprecate FLAGS_quic_always_write_queued_retransmissions.

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 d233ad2aa94cfb1582cc4f817f0f15f93537c32d..fad7c1882f39c427a2f2e32e11dd842759ff92a0 100644
--- a/net/quic/quic_unacked_packet_map.cc
+++ b/net/quic/quic_unacked_packet_map.cc
@@ -91,10 +91,6 @@ void QuicUnackedPacketMap::TransferRetransmissionInfo(
     TransmissionType transmission_type,
     TransmissionInfo* info) {
   if (old_packet_number < least_unacked_) {
-    if (!FLAGS_quic_always_write_queued_retransmissions) {
-      QUIC_BUG << "Old TransmissionInfo no longer exists for:"
-               << old_packet_number << " least_unacked:" << least_unacked_;
-    }
     // This can happen when a retransmission packet is queued because of write
     // blocked socket, and the original packet gets acked before the
     // retransmission gets sent.