The remove_label function should use Twisted requests and return a defered object instead of making requests synchronously.
<rdar://problem/104745772>
Pull request: https://github.com/WebKit/WebKit/pull/9234
Committed 259757@main (8d1b8a680602): <https://commits.webkit.org/259757@main> Reviewed commits have been landed. Closing PR #9234 and removing active labels.