Move ProxyServiceFactory to components/proxy_service/ios.

ios/chrome/browser/BUILD.gn

 # Copyright 2015 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.
 
 import("//build/buildflag_header.gni")
 import("//build/config/features.gni")
 import("//build/config/ios/rules.gni")
 import("//rlz/features/features.gni")
 import("//third_party/protobuf/proto_library.gni")
 
@@ skipping 79 matching lines @@
     "//components/keyed_service/core",
     "//components/keyed_service/ios",
     "//components/metrics",
     "//components/metrics_services_manager",
     "//components/net_log",
     "//components/network_session_configurator",
     "//components/ntp_tiles",
     "//components/pref_registry",
     "//components/prefs",
     "//components/proxy_config",
+    "//components/proxy_config/ios",
     "//components/reading_list/ios",
     "//components/search_engines",
     "//components/signin/core/browser",
     "//components/ssl_config",
     "//components/strings",
     "//components/sync",
     "//components/translate/core/browser",
     "//components/url_formatter",
     "//components/variations",
     "//components/variations/service",
@@ skipping 127 matching lines @@
 
 source_set("browser_internal") {
   sources = [
     "callback_counter.h",
     "callback_counter.mm",
   ]
   deps = [
     "//base",
   ]
 }