I was using "build & restart". I've done that many times since deactivating the chat. Now though, it's not showing that error about the chat either. I first disabled the chat immediately after installing it over a week ago. I've done the rebuild and reload more than a dozen times since then. So that's really weird. I didn't see the icon for it after disabling it, but I was getting those errors in the browser console. Only thing I can think is that most of the "rebuild & reload" where clicking the notification in the bottom left that said to do so rather than from the main dashboard page.

That was it. Ah, I should have noticed that, looking at some other plugins. Thanks.