gfe-relnote: Deprecate gfe2_reloadable_flag_quic_fix_get_packet_header_size

PiperOrigin-RevId: 268463387
Change-Id: I5ba9d04c9b4a6b439c85e17e199d8ff76ec7ffa7
diff --git a/quic/core/quic_packet_creator.cc b/quic/core/quic_packet_creator.cc
index 70d5ccb..0b7a9f2 100644
--- a/quic/core/quic_packet_creator.cc
+++ b/quic/core/quic_packet_creator.cc
@@ -84,9 +84,7 @@
               false),
       pending_padding_bytes_(0),
       needs_full_padding_(false),
-      can_set_transmission_type_(false),
-      fix_get_packet_header_size_(
-          GetQuicReloadableFlag(quic_fix_get_packet_header_size)) {
+      can_set_transmission_type_(false) {
   SetMaxPacketLength(kDefaultMaxPacketSize);
 }
 
@@ -1100,9 +1098,7 @@
   if (framer_->perspective() == Perspective::IS_CLIENT) {
     length_length = VARIABLE_LENGTH_INTEGER_LENGTH_2;
   }
-  if (!QuicVersionHasLongHeaderLengths(framer_->transport_version()) &&
-      fix_get_packet_header_size_) {
-    QUIC_RELOADABLE_FLAG_COUNT_N(quic_fix_get_packet_header_size, 3, 3);
+  if (!QuicVersionHasLongHeaderLengths(framer_->transport_version())) {
     length_length = VARIABLE_LENGTH_INTEGER_LENGTH_0;
   }
   const size_t packet_header_size = GetPacketHeaderSize(