Deprecate gfe2_reloadable_flag_quic_enable_overshooting_detection.

PiperOrigin-RevId: 331589338
Change-Id: I5a1dda1b3e446f4a2c788dd18f9b08a0366eb1b9
diff --git a/quic/core/congestion_control/bbr_sender.cc b/quic/core/congestion_control/bbr_sender.cc
index 7389067..4de1a07 100644
--- a/quic/core/congestion_control/bbr_sender.cc
+++ b/quic/core/congestion_control/bbr_sender.cc
@@ -291,9 +291,7 @@
     max_congestion_window_with_network_parameters_adjusted_ =
         100 * kDefaultTCPMSS;
   }
-  if (GetQuicReloadableFlag(quic_enable_overshooting_detection) &&
-      config.HasClientRequestedIndependentOption(kDTOS, perspective)) {
-    QUIC_RELOADABLE_FLAG_COUNT(quic_enable_overshooting_detection);
+  if (config.HasClientRequestedIndependentOption(kDTOS, perspective)) {
     detect_overshooting_ = true;
     // DTOS would allow pacing rate drop to IW 10 / min_rtt if overshooting is
     // detected.
diff --git a/quic/core/congestion_control/bbr_sender_test.cc b/quic/core/congestion_control/bbr_sender_test.cc
index e0ec278..b476b55 100644
--- a/quic/core/congestion_control/bbr_sender_test.cc
+++ b/quic/core/congestion_control/bbr_sender_test.cc
@@ -1277,9 +1277,6 @@
 }
 
 TEST_F(BbrSenderTest, EnableOvershootingDetection) {
-  if (!GetQuicReloadableFlag(quic_enable_overshooting_detection)) {
-    return;
-  }
   SetConnectionOption(kDTOS);
   CreateSmallBufferSetup();
   // Set a overly large initial cwnd.