relnote: Deprecate --reloadable_flag_quic_use_hash_in_scup

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 e5d48d90fde49e445c2f7560d187caec582c974f..f9f0c430ca066d6d9c50b4d9e9804a0887fa57df 100644
--- a/net/quic/quic_flags.cc
+++ b/net/quic/quic_flags.cc
@@ -81,10 +81,6 @@ bool FLAGS_quic_loss_recovery_use_largest_acked = true;
 // retransmission alarm.  Disabled because it breaks QUIC time loss detection.
 bool FLAGS_quic_only_one_sending_alarm = false;
 
-// If true, the hash of the CHLO message will be used in the proof generated for
-// an SCUP message.
-bool FLAGS_quic_use_hash_in_scup = true;
-
 // If true, QUIC public reset packets will have the \"pre-v33\" public header
 // flags.
 bool FLAGS_quic_use_old_public_reset_packets = true;