UserChangeActionDisabler 205 chrome/browser/ui/ash/multi_user/multi_user_window_manager_chromeos.cc DISALLOW_COPY_AND_ASSIGN(UserChangeActionDisabler); UserChangeActionDisabler 589 chrome/browser/ui/ash/multi_user/multi_user_window_manager_chromeos.cc scoped_ptr<UserChangeActionDisabler> disabler(new UserChangeActionDisabler);