If ENABLE(SERVICE_WORKER) is false then the callback is never invoked. This is causing a stall in TestController::clearServiceWorkerRegistrations.
Created attachment 343089 [details] Patch
Comment on attachment 343089 [details] Patch Clearing flags on attachment: 343089 Committed r232984: <https://trac.webkit.org/changeset/232984>
All reviewed patches have been landed. Closing bug.
<rdar://problem/41265029>