Deprecate quic_send_version_negotiation_fixed_bit

gfe-relnote: deprecate --gfe2_reloadable_flag_quic_send_version_negotiation_fixed_bit
PiperOrigin-RevId: 253919614
Change-Id: I8c28107def019e60543af16cf71fe20db2e27274
diff --git a/quic/core/quic_framer.cc b/quic/core/quic_framer.cc
index cc58806..b439ac0 100644
--- a/quic/core/quic_framer.cc
+++ b/quic/core/quic_framer.cc
@@ -1447,11 +1447,7 @@
   QuicDataWriter writer(len, buffer.get());
 
   // TODO(fayang): Randomly select a value for the type.
-  uint8_t type = static_cast<uint8_t>(FLAGS_LONG_HEADER);
-  if (GetQuicReloadableFlag(quic_send_version_negotiation_fixed_bit)) {
-    QUIC_RELOADABLE_FLAG_COUNT(quic_send_version_negotiation_fixed_bit);
-    type |= static_cast<uint8_t>(FLAGS_FIXED_BIT);
-  }
+  uint8_t type = static_cast<uint8_t>(FLAGS_LONG_HEADER | FLAGS_FIXED_BIT);
   if (!writer.WriteUInt8(type)) {
     return nullptr;
   }