SVG image not displaying CSS base-64 data URL encoded fonts in Illustrator

I'm dynamically generating an SVG that includes text and a font using an embedded base-64 font-face with this method: How do I embed Google Web Fonts into an SVG?

    

Hello World

(Where ... is the long base-64 encoded string.)

When I download the file and open it in my browser (Chrome), I see the text in the correct font, but when I open the file in Adobe Illustrator (CS5), the font is not shown. Instead I see some text in Arial, the fallback font. Is Illustrator picky about some SVG formatting? Does it not know how to parse base-64 data URLs?