Deprecate gfe2_reloadable_flag_quic_fix_server_pto_timeout.

PiperOrigin-RevId: 320959889
Change-Id: I64851bfeb19eb73e796645e8309d8785457d845d
diff --git a/quic/core/quic_sent_packet_manager.cc b/quic/core/quic_sent_packet_manager.cc
index 4ff4927..8e0922b 100644
--- a/quic/core/quic_sent_packet_manager.cc
+++ b/quic/core/quic_sent_packet_manager.cc
@@ -1067,13 +1067,11 @@
     return QuicTime::Zero();
   }
   PacketNumberSpace packet_number_space;
-  if (GetQuicReloadableFlag(quic_fix_server_pto_timeout) &&
-      supports_multiple_packet_number_spaces() &&
+  if (supports_multiple_packet_number_spaces() &&
       unacked_packets_.perspective() == Perspective::IS_SERVER &&
       !GetEarliestPacketSentTimeForPto(&packet_number_space).IsInitialized()) {
     // Do not set the timer on the server side if the only in flight packets are
     // half RTT data.
-    QUIC_RELOADABLE_FLAG_COUNT(quic_fix_server_pto_timeout);
     return QuicTime::Zero();
   }
   switch (GetRetransmissionMode()) {