font: menu not rewritten correctly

[GoogleCodeExporter]

I think that "font: menu" will be rewritten to "font: 32.0/3px menu" (same for 
other special fonts). These forms are reasonably uncommon, but we should still 
rewrite them correctly (we already put in all the effort to parse them)

Original issue reported on code.google.com by sligocki@google.com on 3 Dec 2010 at 6:08