Remove the unused "Disable non-blocking IO" QUIC experiment code.

net/quic/chromium/quic_stream_factory.cc

 // 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.
 
 #include "net/quic/chromium/quic_stream_factory.h"
 
 #include <algorithm>
 #include <tuple>
 #include <utility>
 
@@ skipping 637 matching lines @@
     ChannelIDService* channel_id_service,
     TransportSecurityState* transport_security_state,
     CTVerifier* cert_transparency_verifier,
     SocketPerformanceWatcherFactory* socket_performance_watcher_factory,
     QuicCryptoClientStreamFactory* quic_crypto_client_stream_factory,
     QuicRandom* random_generator,
     QuicClock* clock,
     size_t max_packet_length,
     const std::string& user_agent_id,
     const QuicVersionVector& supported_versions,
-    bool enable_non_blocking_io,
     bool store_server_configs_in_properties,
     bool close_sessions_on_ip_change,
     bool mark_quic_broken_when_network_blackholes,
     int idle_connection_timeout_seconds,
     int reduced_ping_timeout_seconds,
     int packet_reader_yield_after_duration_milliseconds,
     bool migrate_sessions_on_network_change,
     bool migrate_sessions_early,
     bool allow_server_migration,
     bool force_hol_blocking,
@@ skipping 18 matching lines @@
       clock_skew_detector_(base::TimeTicks::Now(), base::Time::Now()),
       socket_performance_watcher_factory_(socket_performance_watcher_factory),
       config_(InitializeQuicConfig(connection_options,
                                    idle_connection_timeout_seconds)),
       crypto_config_(base::WrapUnique(
           new ProofVerifierChromium(cert_verifier,
                                     ct_policy_enforcer,
                                     transport_security_state,
                                     cert_transparency_verifier))),
       supported_versions_(supported_versions),
-      enable_non_blocking_io_(enable_non_blocking_io),
       mark_quic_broken_when_network_blackholes_(
           mark_quic_broken_when_network_blackholes),
       store_server_configs_in_properties_(store_server_configs_in_properties),
       ping_timeout_(QuicTime::Delta::FromSeconds(kPingTimeoutSecs)),
       reduced_ping_timeout_(
           QuicTime::Delta::FromSeconds(reduced_ping_timeout_seconds)),
       yield_after_packets_(kQuicYieldAfterPacketsRead),
       yield_after_duration_(QuicTime::Delta::FromMilliseconds(
           packet_reader_yield_after_duration_milliseconds)),
       close_sessions_on_ip_change_(close_sessions_on_ip_change),
@@ skipping 709 matching lines @@
 }
 
 bool QuicStreamFactory::HasActiveCertVerifierJob(
     const QuicServerId& server_id) const {
   return base::ContainsKey(active_cert_verifier_jobs_, server_id);
 }
 
 int QuicStreamFactory::ConfigureSocket(DatagramClientSocket* socket,
                                        IPEndPoint addr,
                                        NetworkHandle network) {
-  if (enable_non_blocking_io_)
-    socket->UseNonBlockingIO();
+  socket->UseNonBlockingIO();
 
   int rv;
   if (migrate_sessions_on_network_change_) {
     // If caller leaves network unspecified, use current default network.
     if (network == NetworkChangeNotifier::kInvalidNetworkHandle) {
       rv = socket->ConnectUsingDefaultNetwork(addr);
     } else {
       rv = socket->ConnectUsingNetwork(network, addr);
     }
   } else {
@@ skipping 296 matching lines @@
   // Since the session was active, there's no longer an
   // HttpStreamFactoryImpl::Job running which can mark it broken, unless the TCP
   // job also fails. So to avoid not using QUIC when we otherwise could, we mark
   // it as recently broken, which means that 0-RTT will be disabled but we'll
   // still race.
   http_server_properties_->MarkAlternativeServiceRecentlyBroken(
       alternative_service);
 }
 
 }  // namespace net