Remove the unused QUIC port selection logic.

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 "base/metrics/field_trial.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 298 matching lines @@
           load_server_info_timeout_srtt_multiplier;
     }
     params->quic_enable_connection_racing =
         ShouldQuicEnableConnectionRacing(quic_trial_params);
     params->quic_enable_non_blocking_io =
         ShouldQuicEnableNonBlockingIO(quic_trial_params);
     params->quic_disable_disk_cache =
         ShouldQuicDisableDiskCache(quic_trial_params);
     params->quic_prefer_aes = ShouldQuicPreferAes(quic_trial_params);
     params->quic_force_hol_blocking = ShouldForceHolBlocking(quic_trial_params);
-    // Default to disabling port selection on all channels.
-    params->enable_quic_port_selection = false;
     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 71 matching lines @@
   std::string http2_trial_group =
       base::FieldTrialList::FindFullName(kHttp2FieldTrialName);
   ConfigureHttp2Params(http2_trial_group, params);
 
   const std::string tfo_trial_group =
       base::FieldTrialList::FindFullName(kTCPFastOpenFieldTrialName);
   ConfigureTCPFastOpenParams(tfo_trial_group, params);
 }
 
 }  // namespace network_session_configurator