chromeos: Move device shutdown handling out of chrome into ash

ash/test/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/ui.gni")
 
 # Used to test ash with an aura backend.
 source_set("ash_with_aura_test_support") {
   testonly = true
   sources = [
@@ skipping 95 matching lines @@
     "test_keyboard_ui.cc",
     "test_keyboard_ui.h",
     "test_overlay_delegate.cc",
     "test_overlay_delegate.h",
     "test_screenshot_delegate.cc",
     "test_screenshot_delegate.h",
     "test_session_state_animator.cc",
     "test_session_state_animator.h",
     "test_shell_delegate.cc",
     "test_shell_delegate.h",
-    "test_shutdown_client.cc",
-    "test_shutdown_client.h",
     "test_suite.cc",
     "test_suite.h",
     "test_suite_init.h",
     "test_suite_init.mm",
     "test_system_tray_item.cc",
     "test_system_tray_item.h",
     "test_wallpaper_delegate.cc",
     "test_wallpaper_delegate.h",
     "ui_controls_factory_ash.cc",
     "ui_controls_factory_ash.h",
@@ skipping 77 matching lines @@
   deps = [
     ":test_support_with_content",
     "//base",
     "//skia",
     "//testing/gtest",
     "//ui/aura",
     "//ui/base",
     "//ui/gl:test_support",
   ]
 }