Everything old is new again. ;) Jokes aside, I think it's good to serve the fonts directly, there's no need to do a 'phone home' roundtrip to google only to present some fonts.

And while you're at it (and you use multiple fonts), you might as well use CSS's font-face to harmonize the different fonts a little. Fonts with the same size might look bigger or smaller to the eye, depending on thickness of the lines and other font styles.