The problem is that links to http://fonts.googleapis.comreturn stylesheets, not fonts. If you look at the stylesheet that you pull it into, you will find several @ font-face rules that pull fonts out of http://fonts.gstatic.com.
To do this correctly, the Content-Security-Policy header should look something like this:
Content-Security-Policy: default-src 'self'; font-src http:
style-src 'self' 'unsafe-inline' http:
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