§ 498-a. Powers and duties of mayors or managers of certain cities. Notwithstanding any other provision of this article, whenever the charter of any city, or any special or local law, provides that the mayor or manager of such city is the chief law enforcement officer thereof, then and in that event such mayor or manager, as the case may be, shall have, exercise and perform all the powers and duties otherwise prescribed by this article to be exercised and performed by the governing body of such city except those prescribed by section four hundred seventy-eight hereof, and in any such case, the term "governing body of a municipality" as used in this article shall be deemed to mean and include the mayor or manager of any such city.