Deprecate gfe2_reloadable_flag_quic_fix_neuter_handshake_data.

PiperOrigin-RevId: 331621186
Change-Id: I53d0995c39af4dff5983ce5f298f676d0aa34e8e

quic/core/quic_session.cc

diff --git a/quic/core/quic_session.cc b/quic/core/quic_session.cc
index ec17c19..da9a925 100644
--- a/quic/core/quic_session.cc
+++ b/quic/core/quic_session.cc
@@ -1618,11 +1618,8 @@
 }
 
 void QuicSession::NeuterHandshakeData() {
-  if (GetQuicReloadableFlag(quic_fix_neuter_handshake_data)) {
-    QUIC_RELOADABLE_FLAG_COUNT(quic_fix_neuter_handshake_data);
-    GetMutableCryptoStream()->NeuterStreamDataOfEncryptionLevel(
-        ENCRYPTION_HANDSHAKE);
-  }
+  GetMutableCryptoStream()->NeuterStreamDataOfEncryptionLevel(
+      ENCRYPTION_HANDSHAKE);
   connection()->OnHandshakeComplete();
 }