CHANGE_TYPE_DELETE  138 ui/message_center/message_center_impl.cc          (type != CHANGE_TYPE_DELETE || notification_.get() == NULL));
CHANGE_TYPE_DELETE  170 ui/message_center/message_center_impl.cc       case CHANGE_TYPE_DELETE:
CHANGE_TYPE_DELETE  198 ui/message_center/message_center_impl.cc       new Change(CHANGE_TYPE_DELETE, id, scoped_ptr<Notification>()));