Initialize ios/web_view translate with a system-wide URLRequestContext.

ios/web_view/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.
 
 import("//build/config/ios/ios_sdk.gni")
 import("//build/config/ios/rules.gni")
 import("//components/grpc_support/include/headers.gni")
 import("//tools/grit/repack.gni")
 
 config("config") {
@@ skipping 21 matching lines @@
   "public/cwv_translation_controller_delegate.h",
   "public/cwv_translation_language.h",
   "public/cwv_ui_delegate.h",
   "public/cwv_user_content_controller.h",
   "public/cwv_user_script.h",
   "public/cwv_web_view.h",
   "public/cwv_web_view_configuration.h",
 ]
 
 ios_web_view_sources = [
+  "internal/app/application_context.cc",
+  "internal/app/application_context.h",
+  "internal/app/web_view_io_thread.h",
+  "internal/app/web_view_io_thread.mm",
   "internal/cwv_html_element.mm",
   "internal/cwv_html_element_internal.h",
   "internal/cwv_navigation_action.mm",
   "internal/cwv_navigation_action_internal.h",
   "internal/cwv_scroll_view.mm",
   "internal/cwv_scroll_view_internal.h",
   "internal/cwv_user_content_controller.mm",
   "internal/cwv_user_content_controller_internal.h",
   "internal/cwv_user_script.mm",
   "internal/cwv_web_view.mm",
@@ skipping 31 matching lines @@
   "internal/web_view_web_main_parts.mm",
   "internal/web_view_web_state_policy_decider.h",
   "internal/web_view_web_state_policy_decider.mm",
 ]
 ios_web_view_sources += ios_web_view_public_headers
 
 ios_web_view_deps = [
   ":generate_license",
   ":packed_resources",
   "//base",
+  "//components/flags_ui",
   "//components/infobars/core",
   "//components/keyed_service/core",
   "//components/keyed_service/ios",
+  "//components/net_log",
   "//components/pref_registry",
   "//components/prefs",
+  "//components/proxy_config",
+  "//components/ssl_config",
   "//components/translate/core/browser",
   "//components/translate/core/common",
   "//components/translate/ios/browser",
   "//google_apis",
+  "//ios/components/io_thread",
   "//ios/net",
   "//ios/web",
   "//ios/web:reload_type",
   "//ios/web:user_agent",
   "//ios/web/public/app",
   "//net",
   "//net:extras",
   "//ui/base",
   "//url",
 ]
@@ skipping 114 matching lines @@
   ]
   args = [
     "license_file",
     rebase_path(_license_path, root_build_dir),
     "--gn-target",
     "//ios/web_view",
     "--gn-out-dir",
     ".",
   ]
 }