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

net/http/http_network_session.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/http/http_network_session.h"
 
 #include <inttypes.h>
 
 #include <utility>
 
@@ skipping 105 matching lines @@
       testing_fixed_https_port(0),
       enable_tcp_fast_open_for_ssl(false),
       enable_spdy_ping_based_connection_checking(true),
       enable_http2(true),
       spdy_session_max_recv_window_size(kSpdySessionMaxRecvWindowSize),
       time_func(&base::TimeTicks::Now),
       enable_http2_alternative_service(false),
       enable_quic(false),
       mark_quic_broken_when_network_blackholes(false),
       retry_without_alt_svc_on_quic_errors(false),
-      quic_enable_non_blocking_io(false),
       quic_max_server_configs_stored_in_properties(0u),
       quic_clock(nullptr),
       quic_random(nullptr),
       quic_max_packet_length(kDefaultMaxPacketSize),
       enable_user_alternate_protocol_ports(false),
       quic_crypto_client_stream_factory(
           QuicCryptoClientStreamFactory::GetDefaultFactory()),
       quic_close_sessions_on_ip_change(false),
       quic_idle_connection_timeout_seconds(kIdleConnectionTimeoutSeconds),
       quic_reduced_ping_timeout_seconds(kPingTimeoutSecs),
@@ skipping 43 matching lines @@
           params.transport_security_state,
           params.cert_transparency_verifier,
           params.socket_performance_watcher_factory,
           params.quic_crypto_client_stream_factory,
           params.quic_random ? params.quic_random : QuicRandom::GetInstance(),
           params.quic_clock ? params.quic_clock
                             : QuicChromiumClock::GetInstance(),
           params.quic_max_packet_length,
           params.quic_user_agent_id,
           params.quic_supported_versions,
-          params.quic_enable_non_blocking_io,
           params.quic_max_server_configs_stored_in_properties > 0,
           params.quic_close_sessions_on_ip_change,
           params.mark_quic_broken_when_network_blackholes,
           params.quic_idle_connection_timeout_seconds,
           params.quic_reduced_ping_timeout_seconds,
           params.quic_packet_reader_yield_after_duration_milliseconds,
           params.quic_migrate_sessions_on_network_change,
           params.quic_migrate_sessions_early,
           params.quic_allow_server_migration,
           params.quic_force_hol_blocking,
@@ skipping 253 matching lines @@
       CloseIdleConnections();
       break;
   }
 }
 
 void HttpNetworkSession::OnPurgeMemory() {
   CloseIdleConnections();
 }
 
 }  // namespace net