arc: Restore Arc OptIn notification.

chrome/browser/chromeos/BUILD.gn

 # Copyright 2014 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/features.gni")
 import("//build/config/ui.gni")
 import("//extensions/features/features.gni")
 import("//media/media_options.gni")
 import("//printing/features/features.gni")
 import("//third_party/protobuf/proto_library.gni")
@@ skipping 192 matching lines @@
     "app_mode/kiosk_mode_idle_app_name_notification.h",
     "app_mode/kiosk_profile_loader.cc",
     "app_mode/kiosk_profile_loader.h",
     "app_mode/kiosk_session_plugin_handler.cc",
     "app_mode/kiosk_session_plugin_handler.h",
     "app_mode/kiosk_session_plugin_handler_delegate.h",
     "app_mode/startup_app_launcher.cc",
     "app_mode/startup_app_launcher.h",
     "arc/arc_auth_context.cc",
     "arc/arc_auth_context.h",
+    "arc/arc_auth_notification.cc",
+    "arc/arc_auth_notification.h",
     "arc/arc_auth_service.cc",
     "arc/arc_auth_service.h",
     "arc/arc_optin_uma.cc",
     "arc/arc_optin_uma.h",
     "arc/arc_service_launcher.cc",
     "arc/arc_service_launcher.h",
     "arc/arc_session_manager.cc",
     "arc/arc_session_manager.h",
     "arc/arc_support_host.cc",
     "arc/arc_support_host.h",
@@ skipping 1471 matching lines @@
     "policy/proto/chrome_device_policy.proto",
     "policy/proto/install_attributes.proto",
   ]
 }
 
 proto_library("attestation_proto") {
   sources = [
     "attestation/attestation_key_payload.proto",
   ]
 }