Fix webkit font smoothing

There are bug in default webkit @font-face rendering. 
https://code.google.com/p/chromium/issues/detail?id=152304

I think everybody, who use @font-face, knows that in chrome it looks monstrous.

This should make sure text smoothing looks good.

https://code.google.com/p/chromium/issues/detail?id=152304#c135