Deprecate --gfe2_reloadable_flag_quic_bbr2_disable_reno_coexistence.

PiperOrigin-RevId: 357756987
Change-Id: Id6757ccfba485ccce1634b711893badd4fdc9672

quic/core/congestion_control/bbr2_sender.cc

diff --git a/quic/core/congestion_control/bbr2_sender.cc b/quic/core/congestion_control/bbr2_sender.cc
index e8ef762..a29d7ae 100644
--- a/quic/core/congestion_control/bbr2_sender.cc
+++ b/quic/core/congestion_control/bbr2_sender.cc
@@ -151,9 +151,7 @@
     QUIC_RELOADABLE_FLAG_COUNT(quic_bbr2_use_bytes_delivered);
     params_.use_bytes_delivered_for_inflight_hi = true;
   }
-  if (GetQuicReloadableFlag(quic_bbr2_disable_reno_coexistence) &&
-      ContainsQuicTag(connection_options, kB2RC)) {
-    QUIC_RELOADABLE_FLAG_COUNT(quic_bbr2_disable_reno_coexistence);
+  if (ContainsQuicTag(connection_options, kB2RC)) {
     params_.enable_reno_coexistence = false;
   }
   if (ContainsQuicTag(connection_options, kBSAO)) {

quic/core/quic_flags_list.h

diff --git a/quic/core/quic_flags_list.h b/quic/core/quic_flags_list.h
index bdf5853..7b6bd95 100644
--- a/quic/core/quic_flags_list.h
+++ b/quic/core/quic_flags_list.h
@@ -12,7 +12,6 @@
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_allow_client_enabled_bbr_v2, false)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_bbr2_avoid_too_low_probe_bw_cwnd, false)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_bbr2_bw_startup, true)
-QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_bbr2_disable_reno_coexistence, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_bbr2_fewer_startup_round_trips, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_bbr2_reset_max_bytes_delivered, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_bbr2_use_bytes_delivered, true)