Disable Clip to DEVONthink in Chrome on non-OS X machines

When we allow Chrome to sync settings (including extensions) across multiple machines, the Clip to DEVONthink extension can find itself ported over to Windows. Where it doesn’t work. No surprise. Perhaps the extension should disable itself when it wakes up in a non-OS X world.

As far as I know it’s not easy to find out which machine you’re on. But noted. I’ll add it should I find and easy-to-go way.