AOL is revamping its popular online radio service, adding streams from all 140 CBS-owned radio stations and upgrading its player to add more functions and expand the service’s reach. Much is at stake for AOL, which is looking for new ways to boost revenues from online music streaming a year after a panel of copyright judges sharply increased the royalties that online radio providers pay to record labels and artists. Lisa Namerow, the general manager of AOL’s online radio unit, said the company’s music streaming business was still unprofitable.