Deprecate gfe2_reloadable_flag_quic_enable_5aff_connection_option.

PiperOrigin-RevId: 872466491

quiche/common/quiche_feature_flags_list.h

diff --git a/quiche/common/quiche_feature_flags_list.h b/quiche/common/quiche_feature_flags_list.h
index ea7f7b0..5b34813 100755
--- a/quiche/common/quiche_feature_flags_list.h
+++ b/quiche/common/quiche_feature_flags_list.h
@@ -33,7 +33,6 @@
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_disable_version_rfcv1, false, false, "If true, disable QUIC version h3 (RFCv1).")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_discard_initial_packet_with_key_dropped, false, true, "If true, discard INITIAL packet if the key has been dropped.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_disconnect_early_exit, false, false, "If true, does not update ack state if the connection has been closed.")
-QUICHE_FLAG(bool, quiche_reloadable_flag_quic_enable_5aff_connection_option, true, true, "If true, allows QUIC's 5AFF connection option to increase the amplication factor to 5.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_enable_disable_resumption, true, true, "If true, disable resumption when receiving NRES connection option.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_enable_mtu_discovery_at_server, false, false, "If true, QUIC will default enable MTU discovery at server, with a target of 1450 bytes.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_enable_server_on_wire_ping, true, true, "If true, enable server retransmittable on wire PING.")

quiche/quic/core/quic_connection.cc

diff --git a/quiche/quic/core/quic_connection.cc b/quiche/quic/core/quic_connection.cc
index 5c7ea12..d11c8f5 100644
--- a/quiche/quic/core/quic_connection.cc
+++ b/quiche/quic/core/quic_connection.cc
@@ -529,9 +529,7 @@
   if (config.HasClientRequestedIndependentOption(k3AFF, perspective_)) {
     anti_amplification_factor_ = 3;
   }
-  if (GetQuicReloadableFlag(quic_enable_5aff_connection_option) &&
-      config.HasClientRequestedIndependentOption(k5AFF, perspective_)) {
-    QUIC_RELOADABLE_FLAG_COUNT(quic_enable_5aff_connection_option);
+  if (config.HasClientRequestedIndependentOption(k5AFF, perspective_)) {
     anti_amplification_factor_ = 5;
   }
   if (config.HasClientRequestedIndependentOption(k10AF, perspective_)) {