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

net/url_request/url_request_context_builder.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.
 
 // This class is useful for building a simple URLRequestContext. Most creators
 // of new URLRequestContexts should use this helper class to construct it. Call
 // any configuration params, and when done, invoke Build() to construct the
 // URLRequestContext. This URLRequestContext will own all its own storage.
 //
 // URLRequestContextBuilder and its associated params classes are initially
@@ skipping 78 matching lines @@
     HostMappingRules* host_mapping_rules;
     uint16_t testing_fixed_http_port;
     uint16_t testing_fixed_https_port;
     bool enable_spdy31;
     bool enable_http2;
     bool parse_alternative_services;
     bool enable_alternative_service_with_different_host;
     bool enable_quic;
     std::string quic_user_agent_id;
     int quic_max_server_configs_stored_in_properties;
-    bool quic_delay_tcp_race;
     int quic_max_number_of_lossy_connections;
     std::unordered_set<std::string> quic_host_whitelist;
     bool quic_prefer_aes;
     float quic_packet_loss_threshold;
     int quic_idle_connection_timeout_seconds;
     QuicTagVector quic_connection_options;
     bool quic_close_sessions_on_ip_change;
     bool quic_migrate_sessions_on_network_change;
     bool quic_migrate_sessions_early;
     bool quic_disable_bidirectional_streams;
@@ skipping 115 matching lines @@
   void set_quic_user_agent_id(const std::string& quic_user_agent_id) {
     http_network_session_params_.quic_user_agent_id = quic_user_agent_id;
   }
 
   void set_quic_max_server_configs_stored_in_properties(
       int quic_max_server_configs_stored_in_properties) {
     http_network_session_params_.quic_max_server_configs_stored_in_properties =
         quic_max_server_configs_stored_in_properties;
   }
 
-  void set_quic_delay_tcp_race(bool quic_delay_tcp_race) {
-    http_network_session_params_.quic_delay_tcp_race = quic_delay_tcp_race;
-  }
-
   void set_quic_max_number_of_lossy_connections(
       int quic_max_number_of_lossy_connections) {
     http_network_session_params_.quic_max_number_of_lossy_connections =
         quic_max_number_of_lossy_connections;
   }
 
   void set_quic_packet_loss_threshold(float quic_packet_loss_threshold) {
     http_network_session_params_.quic_packet_loss_threshold =
         quic_packet_loss_threshold;
   }
@@ skipping 121 matching lines @@
   std::unique_ptr<HttpServerProperties> http_server_properties_;
   std::map<std::string, std::unique_ptr<URLRequestJobFactory::ProtocolHandler>>
       protocol_handlers_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestContextBuilder);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_CONTEXT_BUILDER_H_