QUIC - enable "delay_tcp_race" parameter by default. This feature showed

net/http/http_network_session.h

 // 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.
 
 #ifndef NET_HTTP_HTTP_NETWORK_SESSION_H_
 #define NET_HTTP_HTTP_NETWORK_SESSION_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 125 matching lines @@
     // Prefer AES-GCM to ChaCha20 even if no hardware support is present.
     bool quic_prefer_aes;
     // Specifies the maximum number of connections with high packet loss in
     // a row after which QUIC will be disabled.
     int quic_max_number_of_lossy_connections;
     // Specifies packet loss rate in fraction after which a connection is
     // closed and is considered as a lossy connection.
     float quic_packet_loss_threshold;
     // Size in bytes of the QUIC DUP socket receive buffer.
     int quic_socket_receive_buffer_size;
-    // Delay starting a TCP connection when QUIC believes it can speak
-    // 0-RTT to a server.
-    bool quic_delay_tcp_race;
     // Maximum number of server configs that are to be stored in
     // HttpServerProperties, instead of the disk cache.
     size_t quic_max_server_configs_stored_in_properties;
     // If not empty, QUIC will be used for all connections to the set of
     // origins in |origins_to_force_quic_on|.
     std::set<HostPortPair> origins_to_force_quic_on;
     // Source of time for QUIC connections. Will be owned by QuicStreamFactory.
     QuicClock* quic_clock;
     // Source of entropy for QUIC connections.
     QuicRandom* quic_random;
@@ skipping 140 matching lines @@
 
   NextProtoVector next_protos_;
   bool enabled_protocols_[NUM_VALID_ALTERNATE_PROTOCOLS];
 
   Params params_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_SESSION_H_