Convert RemoveFlagsOnPatch to a new-style step and convert it's request to Twisted's asynchronous requests.
<rdar://problem/104752905>
Pull request: https://github.com/WebKit/WebKit/pull/9244
Created attachment 464807 [details] Patch
Committed 259728@main (31ea862d60c2): <https://commits.webkit.org/259728@main> Reviewed commits have been landed. Closing PR #9244 and removing active labels.