Add a missing flag count for gfe2_reloadable_flag_quic_bbr_one_mss_conservation.

gfe-relnote: n/a (Flag count)
PiperOrigin-RevId: 279740461
Change-Id: If63cfc75d3aa84629ffb56bd9b4ad70df4e6d346

quic/core/congestion_control/bbr_sender.cc

diff --git a/quic/core/congestion_control/bbr_sender.cc b/quic/core/congestion_control/bbr_sender.cc
index 478339a..a734c03 100644
--- a/quic/core/congestion_control/bbr_sender.cc
+++ b/quic/core/congestion_control/bbr_sender.cc
@@ -894,6 +894,7 @@
   recovery_window_ = std::max(
       recovery_window_, unacked_packets_->bytes_in_flight() + bytes_acked);
   if (GetQuicReloadableFlag(quic_bbr_one_mss_conservation)) {
+    QUIC_RELOADABLE_FLAG_COUNT(quic_bbr_one_mss_conservation);
     recovery_window_ =
         std::max(recovery_window_,
                  unacked_packets_->bytes_in_flight() + kMaxSegmentSize);