relnote: Deprecate FLAGS_quic_dont_ack_acks.

net/quic/quic_flags.cc

Index: net/quic/quic_flags.cc
diff --git a/net/quic/quic_flags.cc b/net/quic/quic_flags.cc
index 6c4a082a9ae3ff31df82c3d117bf5550bd337b72..7ecc8230cc61c9539b5b5bfb45df62b21316be4d 100644
--- a/net/quic/quic_flags.cc
+++ b/net/quic/quic_flags.cc
@@ -45,9 +45,6 @@ bool FLAGS_enable_quic_stateless_reject_support = true;
 // If true, flow controller may grow the receive window size if necessary.
 bool FLAGS_quic_auto_tune_receive_window = true;
 
-// Don't ack acks in QUIC, even when there is a recent missing packet.
-bool FLAGS_quic_dont_ack_acks = true;
-
 // Enables sending of FEC packet only when FEC alarm goes off.
 bool FLAGS_quic_send_fec_packet_only_on_fec_alarm = true;