When using a new-style buildbot step, the run() command will return a defered object. This means that if we're using '@defer.inlineCallbacks', we need to use defer.returnValue instead of returning something.
<rdar://problem/104398102>
Pull request: https://github.com/WebKit/WebKit/pull/8795
Committed 259281@main (29e63587c7cd): <https://commits.webkit.org/259281@main> Reviewed commits have been landed. Closing PR #8795 and removing active labels.