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

components/network_session_configurator/network_session_configurator.cc

 // Copyright 2016 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 "components/network_session_configurator/network_session_configurator.h"
 
 #include <map>
 #include <unordered_set>
 
 #include "base/metrics/field_trial.h"
@@ skipping 116 matching lines @@
     const VariationParameters& quic_trial_params) {
   VariationParameters::const_iterator it =
       quic_trial_params.find("connection_options");
   if (it == quic_trial_params.end()) {
     return net::QuicTagVector();
   }
 
   return net::ParseQuicConnectionOptions(it->second);
 }
 
-bool ShouldQuicEnableNonBlockingIO(
-    const VariationParameters& quic_trial_params) {
-  return base::LowerCaseEqualsASCII(
-      GetVariationParam(quic_trial_params, "enable_non_blocking_io"), "true");
-}
-
 bool ShouldForceHolBlocking(const VariationParameters& quic_trial_params) {
   return base::LowerCaseEqualsASCII(
       GetVariationParam(quic_trial_params, "force_hol_blocking"), "true");
 }
 
 bool ShouldQuicCloseSessionsOnIpChange(
     const VariationParameters& quic_trial_params) {
   return base::LowerCaseEqualsASCII(
       GetVariationParam(quic_trial_params, "close_sessions_on_ip_change"),
       "true");
@@ skipping 113 matching lines @@
   params->mark_quic_broken_when_network_blackholes =
       ShouldMarkQuicBrokenWhenNetworkBlackholes(quic_trial_params);
 
   params->enable_server_push_cancellation =
       ShouldEnableServerPushCancelation(quic_trial_params);
 
   params->retry_without_alt_svc_on_quic_errors =
       ShouldRetryWithoutAltSvcOnQuicErrors(quic_trial_params);
 
   if (params->enable_quic) {
-    params->quic_enable_non_blocking_io =
-        ShouldQuicEnableNonBlockingIO(quic_trial_params);
     params->quic_force_hol_blocking = ShouldForceHolBlocking(quic_trial_params);
     params->quic_connection_options =
         GetQuicConnectionOptions(quic_trial_params);
     params->quic_close_sessions_on_ip_change =
         ShouldQuicCloseSessionsOnIpChange(quic_trial_params);
     int idle_connection_timeout_seconds =
         GetQuicIdleConnectionTimeoutSeconds(quic_trial_params);
     if (idle_connection_timeout_seconds != 0) {
       params->quic_idle_connection_timeout_seconds =
           idle_connection_timeout_seconds;
@@ skipping 91 matching lines @@
   ConfigureTCPFastOpenParams(tfo_trial_group, params);
 
   std::map<std::string, std::string> proxy_preconnects_trial_params;
   variations::GetVariationParams("NetProxyPreconnects",
                                  &proxy_preconnects_trial_params);
   ConfigureOptimizePreconnectsToProxiesParams(proxy_preconnects_trial_params,
                                               params);
 }
 
 }  // namespace network_session_configurator