fix bug in QUIC force HOL blocking experiment, guarded by --quic_enable_version_36_v2.

net/quic/core/quic_flags.cc

 // 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.
 
 #include "net/quic/core/quic_flags.h"
 
 // If true, it will return as soon as an error is detected while validating
 // CHLO.
 bool FLAGS_use_early_return_when_verifying_chlo = true;
 
@@ skipping 75 matching lines @@
 // Do not use a QuicAckListener in order to confirm a larger Path MTU.
 bool FLAGS_quic_no_mtu_discovery_ack_listener = true;
 
 // Deprecate QuicPacketCreator::next_packet_number_length_ because it's no
 // longer necessary.
 bool FLAGS_quic_simple_packet_number_length = true;
 
 // If true, enables QUIC_VERSION_35.
 bool FLAGS_quic_enable_version_35 = true;
 
+// If true, re-enables QUIC_VERSION_36.
+bool FLAGS_quic_enable_version_36 = true;
+
 // If true, enables QUIC_VERSION_36.
-bool FLAGS_quic_enable_version_36 = true;
+bool FLAGS_quic_enable_version_36_v2 = true;
 
 // If true, requires support for X509 certificates in QUIC CHLO PDMDs.
 bool FLAGS_quic_require_x509 = true;
 
 // If true, deprecate safeguards for b/26023400.
 bool FLAGS_quic_deprecate_kfixd = false;
 
 // If true, use async codepaths to invoke ProofSource::GetProof.
 bool FLAGS_enable_async_get_proof = false;
 
@@ skipping 42 matching lines @@
 // If true, use the CHLO packet size, not message size when determining how
 // large a REJ can be.
 bool FLAGS_quic_use_chlo_packet_size = true;
 
 // If true, defer creation of new connection till its CHLO arrives.
 bool FLAGS_quic_buffer_packet_till_chlo = true;
 
 // If true, the connection will check whether it is application-limited, and
 // notify the congestion controller about it.
 bool FLAGS_quic_enable_app_limited_check = true;