Deprecate FLAGS_quic_disable_pre_30. Remove QUIC versions [25-29].

net/quic/quic_crypto_server_stream.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_crypto_server_stream.h"
 
 #include <memory>
 
 #include "base/base64.h"
 #include "crypto/secure_hash.h"
@@ skipping 96 matching lines @@
     send_server_config_update_cb_->Cancel();
     send_server_config_update_cb_ = nullptr;
   }
 }
 
 void QuicCryptoServerStream::OnHandshakeMessage(
     const CryptoHandshakeMessage& message) {
   QuicCryptoServerStreamBase::OnHandshakeMessage(message);
   ++num_handshake_messages_;
 
-  // It's only safe to deprecate kFIXD where we have deprecated v25
-  bool require_kfixd =
-      !FLAGS_quic_deprecate_kfixd || !FLAGS_quic_disable_pre_30;
+  bool require_kfixd = !FLAGS_quic_deprecate_kfixd;
 
   if (require_kfixd && !HasFixedTag(message)) {
     CloseConnectionWithDetails(QUIC_CRYPTO_MESSAGE_PARAMETER_NOT_FOUND,
                                "Missing kFIXD");
     return;
   }
 
   // Do not process handshake messages after the handshake is confirmed.
   if (handshake_confirmed_) {
     CloseConnectionWithDetails(QUIC_CRYPTO_MESSAGE_AFTER_HANDSHAKE_COMPLETE,
@@ skipping 351 matching lines @@
 QuicConnectionId QuicCryptoServerStream::GenerateConnectionIdForReject(
     QuicConnectionId connection_id) {
   // TODO(rch): Remove this method when
   // reloadable_flag_quic_dispatcher_creates_id2 is removed.
   QuicServerSessionBase* session_base =
       static_cast<QuicServerSessionBase*>(session());
   return session_base->GenerateConnectionIdForReject(connection_id);
 }
 
 }  // namespace net