gfe-relnote: Deprecate gfe2_reloadable_flag_quic_use_standard_deviation_for_pto.

PiperOrigin-RevId: 305041560
Change-Id: I80a8a5475db78a28eff13f46b8d51d34efd2ff68

quic/core/quic_sent_packet_manager.cc

diff --git a/quic/core/quic_sent_packet_manager.cc b/quic/core/quic_sent_packet_manager.cc
index 0de1dad..da9f6d4 100644
--- a/quic/core/quic_sent_packet_manager.cc
+++ b/quic/core/quic_sent_packet_manager.cc
@@ -203,9 +203,7 @@
         first_pto_srtt_multiplier_ = 1.5;
       }
     }
-    if (GetQuicReloadableFlag(quic_use_standard_deviation_for_pto) &&
-        config.HasClientSentConnectionOption(kPSDA, perspective)) {
-      QUIC_RELOADABLE_FLAG_COUNT(quic_use_standard_deviation_for_pto);
+    if (config.HasClientSentConnectionOption(kPSDA, perspective)) {
       use_standard_deviation_for_pto_ = true;
       rtt_stats_.EnableStandardDeviationCalculation();
     }

quic/core/quic_sent_packet_manager_test.cc

diff --git a/quic/core/quic_sent_packet_manager_test.cc b/quic/core/quic_sent_packet_manager_test.cc
index 98e6af0..e59446d 100644
--- a/quic/core/quic_sent_packet_manager_test.cc
+++ b/quic/core/quic_sent_packet_manager_test.cc
@@ -3484,7 +3484,6 @@
 }
 
 TEST_F(QuicSentPacketManagerTest, ComputingProbeTimeoutUsingStandardDeviation) {
-  SetQuicReloadableFlag(quic_use_standard_deviation_for_pto, true);
   EnablePto(k1PTO);
   // Use PTOS and PSDA.
   QuicConfig config;