Whenever, as a result of any school district unification proceeding all of the territory under the jurisdiction of the county superintendent of schools is included in a single unified school district and the maintenance of any schools or classes or the performance of any other function theretofore under the jurisdiction of the county superintendent of schools is assumed by such unified school district, the inclusion shall, with respect to any employee, whether in a position requiring certification qualifications or in a position not requiring certification qualifications, who was theretofore employed by the county superintendent of schools in connection with such school, class, or function, be deemed to be the inclusion of a school district in the unified district. The rights of such an employee to employment with the unified district shall be governed by the laws defining the rights of employees of a predecessor school district included within a unified school district to continue in employment as employees of the including unified school district.