Deprecate --gfe2_reloadable_flag_quic_bbr2_use_bytes_delivered.

PiperOrigin-RevId: 360209987
Change-Id: I906ca63de6daaad12602d768530a3925d10c8bca

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 a29d7ae..db6a31a 100644
--- a/quic/core/congestion_control/bbr2_sender.cc
+++ b/quic/core/congestion_control/bbr2_sender.cc
@@ -146,9 +146,7 @@
   if (ContainsQuicTag(connection_options, kB2H2)) {
     params_.limit_inflight_hi_by_max_delivered = true;
   }
-  if (GetQuicReloadableFlag(quic_bbr2_use_bytes_delivered) &&
-      ContainsQuicTag(connection_options, kB2DL)) {
-    QUIC_RELOADABLE_FLAG_COUNT(quic_bbr2_use_bytes_delivered);
+  if (ContainsQuicTag(connection_options, kB2DL)) {
     params_.use_bytes_delivered_for_inflight_hi = true;
   }
   if (ContainsQuicTag(connection_options, kB2RC)) {

quic/core/quic_flags_list.h

diff --git a/quic/core/quic_flags_list.h b/quic/core/quic_flags_list.h
index 73ad556..92780bd 100644
--- a/quic/core/quic_flags_list.h
+++ b/quic/core/quic_flags_list.h
@@ -14,7 +14,6 @@
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_bbr2_bw_startup, 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)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_can_send_ack_frequency, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_close_connection_on_0rtt_packet_number_higher_than_1rtt, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_close_connection_with_too_many_outstanding_packets, true)