I just recently set up a local WordPress development environment and imported the content from the live site into it using WordPress' built-in export and import functionality.
Unfortunately, this showed up in the header, and is making the local site extremely slow when working offline:
<link rel="stylesheet" id="open-sans-css" href="//fonts.googleapis.com/css?family=Open+Sans%3A300italic%2C400italic%2C600italic%2C300%2C400%2C600&subset=latin%2Clatin-ext&ver=3.8.1" type="text/css" media="all">
I'm fairly certain I remember adding this reference to a theme several months ago in its dedicated "Theme Settings" section of the admin interface. Said theme is no longer installed, and I can't even recall its name.
I've gone through and searched all the current theme's files just to make sure that I hadn't added this to the current theme and simply forgotten; and, no, I hadn't.
My question: How can I discover what is adding this reference; and, more importantly, remove it?