Move ProxyServiceFactory to components/proxy_service/ios.

ios/chrome/browser/net/BUILD.gn

 # 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.
 
 source_set("net") {
   configs += [ "//build/config/compiler:enable_arc" ]
   sources = [
     "chrome_cookie_store_ios_client.h",
     "chrome_cookie_store_ios_client.mm",
     "connection_type_observer_bridge.h",
     "connection_type_observer_bridge.mm",
     "cookie_util.h",
     "cookie_util.mm",
     "crl_set_fetcher.cc",
     "crl_set_fetcher.h",
     "http_server_properties_manager_factory.cc",
     "http_server_properties_manager_factory.h",
     "ios_chrome_http_user_agent_settings.h",
     "ios_chrome_http_user_agent_settings.mm",
     "ios_chrome_network_delegate.cc",
     "ios_chrome_network_delegate.h",
     "ios_chrome_url_request_context_getter.cc",
     "ios_chrome_url_request_context_getter.h",
-    "proxy_service_factory.cc",
-    "proxy_service_factory.h",
     "retryable_url_fetcher.h",
     "retryable_url_fetcher.mm",
   ]
   deps = [
     "//base",
     "//components/component_updater",
     "//components/content_settings/core/browser",
     "//components/pref_registry",
     "//components/prefs",
-    "//components/proxy_config",
     "//components/update_client",
     "//ios/chrome/browser",
     "//ios/chrome/browser/browser_state",
     "//ios/chrome/browser/browsing_data",
     "//ios/net",
     "//ios/web",
     "//net",
     "//net:extras",
     "//url",
   ]
@@ skipping 40 matching lines @@
   deps = [
     "//base",
     "//ios/chrome/test/app:test_support",
     "//ios/chrome/test/earl_grey:test_support",
     "//ios/third_party/earl_grey",
     "//ios/web:test_support",
     "//url",
   ]
   libs = [ "XCTest.framework" ]
 }