gfe-relnote: Deprecate gfe2_reloadable_flag_quic_enable_pto.

PiperOrigin-RevId: 289149900
Change-Id: I6eaff9cd45487f4506da63e102f849ac0c44f56e
diff --git a/quic/core/quic_sent_packet_manager.cc b/quic/core/quic_sent_packet_manager.cc
index 6f5e348..842e5e8 100644
--- a/quic/core/quic_sent_packet_manager.cc
+++ b/quic/core/quic_sent_packet_manager.cc
@@ -148,16 +148,12 @@
     min_rto_timeout_ = kAlarmGranularity;
   }
 
-  if (GetQuicReloadableFlag(quic_enable_pto)) {
-    if (config.HasClientSentConnectionOption(k2PTO, perspective)) {
-      pto_enabled_ = true;
-      QUIC_RELOADABLE_FLAG_COUNT_N(quic_enable_pto, 2, 8);
-    }
-    if (config.HasClientSentConnectionOption(k1PTO, perspective)) {
-      pto_enabled_ = true;
-      max_probe_packets_per_pto_ = 1;
-      QUIC_RELOADABLE_FLAG_COUNT_N(quic_enable_pto, 1, 8);
-    }
+  if (config.HasClientSentConnectionOption(k2PTO, perspective)) {
+    pto_enabled_ = true;
+  }
+  if (config.HasClientSentConnectionOption(k1PTO, perspective)) {
+    pto_enabled_ = true;
+    max_probe_packets_per_pto_ = 1;
   }
 
   if (GetQuicReloadableFlag(quic_skip_packet_number_for_pto) &&
@@ -174,19 +170,15 @@
 
   if (pto_enabled_) {
     if (config.HasClientSentConnectionOption(kPTOA, perspective)) {
-      QUIC_RELOADABLE_FLAG_COUNT_N(quic_enable_pto, 5, 8);
       always_include_max_ack_delay_for_pto_timeout_ = false;
     }
     if (config.HasClientSentConnectionOption(kPEB1, perspective)) {
-      QUIC_RELOADABLE_FLAG_COUNT_N(quic_enable_pto, 6, 8);
       StartExponentialBackoffAfterNthPto(1);
     }
     if (config.HasClientSentConnectionOption(kPEB2, perspective)) {
-      QUIC_RELOADABLE_FLAG_COUNT_N(quic_enable_pto, 7, 8);
       StartExponentialBackoffAfterNthPto(2);
     }
     if (config.HasClientSentConnectionOption(kPVS1, perspective)) {
-      QUIC_RELOADABLE_FLAG_COUNT_N(quic_enable_pto, 8, 8);
       pto_rttvar_multiplier_ = 2;
     }
     if (config.HasClientSentConnectionOption(kPAG1, perspective)) {