'Add delete mutations to row, but don\'t commit.'

def _DeleteAllTimeStamps(self, row, attribute_list):

    delete_dict = {}
    for attribute in attribute_list:
        (family, column) = self.GetFamilyColumn(attribute)
        delete_dict.setdefault(family, []).append(column)
    for (family, column) in delete_dict.iteritems():
        row.delete_cells(family, column)
