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

net/quic/quic_stream_factory.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_QUIC_QUIC_STREAM_FACTORY_H_
 #define NET_QUIC_QUIC_STREAM_FACTORY_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 137 matching lines @@
       bool enable_connection_racing,
       bool enable_non_blocking_io,
       bool disable_disk_cache,
       bool prefer_aes,
       int max_number_of_lossy_connections,
       float packet_loss_threshold,
       int max_recent_disabled_reasons,
       int threshold_timeouts_with_streams_open,
       int threshold_public_resets_post_handshake,
       int socket_receive_buffer_size,
-      bool delay_tcp_race,
       int max_server_configs_stored_in_properties,
       bool close_sessions_on_ip_change,
       bool disable_quic_on_timeout_with_open_streams,
       int idle_connection_timeout_seconds,
       bool migrate_sessions_on_network_change,
       bool migrate_sessions_early,
       const QuicTagVector& connection_options,
       bool enable_token_binding);
   ~QuicStreamFactory() override;
 
@@ skipping 146 matching lines @@
   void set_quic_server_info_factory(
       QuicServerInfoFactory* quic_server_info_factory);
 
   bool enable_connection_racing() const { return enable_connection_racing_; }
   void set_enable_connection_racing(bool enable_connection_racing) {
     enable_connection_racing_ = enable_connection_racing;
   }
 
   int socket_receive_buffer_size() const { return socket_receive_buffer_size_; }
 
-  bool delay_tcp_race() const { return delay_tcp_race_; }
-
  private:
   class Job;
   friend class test::QuicStreamFactoryPeer;
   FRIEND_TEST_ALL_PREFIXES(HttpStreamFactoryTest, QuicLossyProxyMarkedAsBad);
 
   typedef std::map<QuicServerId, QuicChromiumClientSession*> SessionMap;
   typedef std::map<QuicChromiumClientSession*, QuicServerId> SessionIdMap;
   typedef std::set<QuicServerId> AliasSet;
   typedef std::map<QuicChromiumClientSession*, AliasSet> SessionAliasMap;
   typedef std::set<QuicChromiumClientSession*> SessionSet;
@@ skipping 172 matching lines @@
   // determine good threshold values.
   int max_public_resets_post_handshake_;
   int max_timeouts_with_open_streams_;
   // Thresholds if greater than zero, determine when to
   int threshold_timeouts_with_open_streams_;
   int threshold_public_resets_post_handshake_;
 
   // Size of the UDP receive buffer.
   int socket_receive_buffer_size_;
 
-  // Set if we do want to delay TCP connection when it is racing with QUIC.
-  bool delay_tcp_race_;
-
   // If more than |yield_after_packets_| packets have been read or more than
   // |yield_after_duration_| time has passed, then
   // QuicChromiumPacketReader::StartReading() yields by doing a PostTask().
   int yield_after_packets_;
   QuicTime::Delta yield_after_duration_;
 
   // Set if all sessions should be closed when any local IP address changes.
   const bool close_sessions_on_ip_change_;
 
   // Set if migration should be attempted on active sessions when primary
@@ skipping 30 matching lines @@
   base::TaskRunner* task_runner_;
 
   base::WeakPtrFactory<QuicStreamFactory> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicStreamFactory);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_STREAM_FACTORY_H_