Move some of IOThread's command line logic to network_session_configurator.

ios/components/io_thread/BUILD.gn

 # Copyright 2017 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.
 
 component("io_thread") {
   configs += [ "//build/config/compiler:enable_arc" ]
 
   deps = [
     "//base",
     "//components/net_log",
-    "//components/network_session_configurator",
+    "//components/network_session_configurator/browser",
     "//components/prefs",
     "//components/proxy_config",
     "//components/proxy_config/ios",
     "//components/ssl_config",
     "//components/variations",
     "//components/version_info",
     "//ios/web",
     "//ios/web:user_agent",
     "//net",
   ]
@@ skipping 17 matching lines @@
     "//components/prefs:test_support",
     "//components/proxy_config",
     "//components/ssl_config",
     "//ios/web",
     "//ios/web/public/test",
     "//net",
     "//net:test_support",
     "//testing/gtest",
   ]
 }