extensionDownloader: Stop handling 'blacklist' operation
Blacklist support was added all the way back in commit 1e286e43, but the code had been defunctional until recently. While uninstalling an extension that has been blacklisted makes sense off-hand, unfortunately we don't know if an extension was actually blacklisted:
The website returns that operation for any extensions for which it doesn't find any versions that match the shell version. That is, the most likely reason is that the user updated to a new GNOME release which the extension doesn't support yet.
It doesn't look like the website is going to change that behavior any time soon[0], so drop the 'blacklist' handling for the time being.
Edited by Florian Müllner