Google Fonts cause unsecure warnings when using SSL

When viewing pages using SSL (i.e. https://...) the browser will warn users that there are insecure items on the page. The inclusion of Google Fonts in the design.css file using http is the source of the problem. I edited my copy, simply removing the "http:" part, leaving the include lines like "@import url(//fonts.googleapis.com/...)" and it appears to fix it for me.

I also found some info at http://drupal.org/node/1851522 - particularly comment #3 is interesting as the solution I used might not be the best.