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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _item_to_database(self, iterator, database_pb):
 """Convert a database protobuf to the native object. :type iterator: :class:`~google.api_core.page_iterator.Iterator` :param iterator: The iterator that is currently in use. :type database_pb: :class:`~google.spanner.admin.database.v1.Database` :param database_pb: A database returned from the API. :rtype: :class:`~google.cloud.spanner_v1.database.Database` :returns: The next database in the page. """

        return Database.from_pb(database_pb, self, pool=BurstyPool())