Trying to fix a link within a theme

I am trying to secure one of my sites to use https://. This site uses the Responsive Business Theme.

One of the links that is unsecured is one to the Google fonts. Here is the error message I get:

Insecure Stylesheet: <link rel=’stylesheet’ id=’googleFonts-css’ href=’https://fonts.googleapis.com/css?family=Roboto%3A300%2C400%2C500%2C700&ver=0b5ad0d213e4bebfaa47e783f25b0667&#8242; type=’text/css’ media=’all’ />

Any idea where this link would be – in what file? I can’t seem to find it.

I would also suggest that all themes be updated with https:// when linking to external sites. Google and others are indicating that site rankings will be affected.

Thanks!

Kelly