cros: Prevent casual shut down and power save during migration.

chrome/browser/ui/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/chromecast_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 1260 matching lines @@
       "views/select_file_dialog_extension.h",
       "views/select_file_dialog_extension_factory.cc",
       "views/select_file_dialog_extension_factory.h",
     ]
     deps += [
       "//chrome/browser/chromeos",
       "//components/arc",
       "//components/drive:drive_chromeos",
       "//components/exo",
       "//components/login",
+      "//device/power_save_blocker",
       "//ui/base/ime",
       "//ui/chromeos",
       "//ui/chromeos/events",
     ]
     if (enable_rlz) {
       deps += [ "//chrome/browser:rlz" ]
     }
   }
   if (use_cups) {
     configs += [ "//printing:cups" ]
@@ skipping 2281 matching lines @@
       "test/test_confirm_bubble_model.cc",
       "test/test_confirm_bubble_model.h",
     ]
     deps += [ "//chrome/test:test_support_ui" ]
   }
 
   if (enable_extensions) {
     deps += [ "//extensions/browser" ]
   }
 }