By Malathi Nayak SAN FRANCISCO (Reuters) – Zynga Inc appointed former Best Buy executive David Lee its chief financial officer as Zynga continued reshuffling its ranks to try to return the Farmville creator to growth. Lee, 42, will step into the role on April 14 and replace current Chief Financial Officer Mark Vranesh, who has decided to leave the company, the games publisher said in a regulator filing late last week. Zynga has sought to revive its business by overhauling top management, trimming staff and introducing titles that can be played on smartphones and tablets. Lee was previously the senior vice president of corporate finance, treasury, mergers and acquisitions and corporate strategy at retail giant Best Buy.