Deprecate FLAGS_quic_require_handshake_confirmation_pre33.

net/quic/core/quic_flags_list.h

 // Copyright 2014 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.
 
 // This file intentionally does not have header guards, it's included
 // inside a macro to generate values.
 
 // This file contains the list of QUIC protocol flags.
 
 // If true, QUIC BBR congestion control may be enabled via Finch and/or via QUIC
@@ skipping 43 matching lines @@
 // If true, QUIC respect HTTP2 SETTINGS frame rather than always close the
 // connection.
 QUIC_FLAG(bool, FLAGS_quic_respect_http2_settings_frame, true)
 
 // If true, re-enables QUIC_VERSION_36.
 QUIC_FLAG(bool, FLAGS_quic_enable_version_36_v3, false)
 
 // If true, use async codepaths to invoke ProofSource::GetProof.
 QUIC_FLAG(bool, FLAGS_enable_async_get_proof, false)
 
-// If true, requires handshake confirmations for all QUIC handshakes with
-// versions less than 33.
-QUIC_FLAG(bool, FLAGS_quic_require_handshake_confirmation_pre33, false)
-
 // If true, only open limited number of quic sessions per epoll event. Leave the
 // rest to next event.
 QUIC_FLAG(bool, FLAGS_quic_limit_num_new_sessions_per_epoll_loop, true)
 
 // Only close the connection on the 5th RTO client side when the 5RTO option
 // is enabled.
 QUIC_FLAG(bool, FLAGS_quic_only_5rto_client_side, false)
 
 // If true, QUIC server push will enabled by default.
 QUIC_FLAG(bool, FLAGS_quic_enable_server_push_by_default, true)
@@ skipping 67 matching lines @@
 // help.
 QUIC_FLAG(bool, FLAGS_quic_fix_version_manager, false)
 
 // Add a new client connection options field to QuicOptions which is only used
 // to configure client side features, such as congestion control.
 QUIC_FLAG(bool, FLAGS_quic_client_connection_options, true)
 
 // If true, fix some casts that were causing off-by-one errors in QUIC's cubic
 // "convex" increases.
 QUIC_FLAG(bool, FLAGS_quic_fix_cubic_convex_mode, true)