Deprecate gfe2_reloadable_flag_quic_fix_checking_should_generate_packet.

PiperOrigin-RevId: 318809766
Change-Id: I85851225f8d47e7295b7db6dc0059f099a5dd950
diff --git a/quic/core/quic_packet_creator.cc b/quic/core/quic_packet_creator.cc
index 56c3050..e6f01ea 100644
--- a/quic/core/quic_packet_creator.cc
+++ b/quic/core/quic_packet_creator.cc
@@ -1360,13 +1360,9 @@
 
   size_t total_bytes_consumed = 0;
 
-  while (total_bytes_consumed < write_length &&
-         (!GetQuicReloadableFlag(quic_fix_checking_should_generate_packet) ||
-          delegate_->ShouldGeneratePacket(HAS_RETRANSMITTABLE_DATA,
-                                          IS_HANDSHAKE))) {
-    if (GetQuicReloadableFlag(quic_fix_checking_should_generate_packet)) {
-      QUIC_RELOADABLE_FLAG_COUNT(quic_fix_checking_should_generate_packet);
-    }
+  while (
+      total_bytes_consumed < write_length &&
+      delegate_->ShouldGeneratePacket(HAS_RETRANSMITTABLE_DATA, IS_HANDSHAKE)) {
     QuicFrame frame;
     if (!ConsumeCryptoDataToFillCurrentPacket(
             level, write_length - total_bytes_consumed,