gfe-relnote: Deprecate gfe2_restart_flag_quic_uint64max_uninitialized_pn.

PiperOrigin-RevId: 239406856
Change-Id: If9019c232ee3a37cf5bbdf4e0cae996346d7ba77
diff --git a/quic/core/quic_framer.cc b/quic/core/quic_framer.cc
index 08c0121..333fe59 100644
--- a/quic/core/quic_framer.cc
+++ b/quic/core/quic_framer.cc
@@ -345,9 +345,7 @@
 
 bool IsValidFullPacketNumber(uint64_t full_packet_number,
                              QuicTransportVersion version) {
-  return full_packet_number > 0 ||
-         (GetQuicRestartFlag(quic_uint64max_uninitialized_pn) &&
-          version == QUIC_VERSION_99);
+  return full_packet_number > 0 || version == QUIC_VERSION_99;
 }
 
 // Convert a stream ID to a count of streams, for IETF QUIC/Version 99 only.