Drop unnecessary "ServiceWorker Task Thread" in SWServer. We're spinning a thread for each SWServer that is never used.
Created attachment 332559 [details] Patch
Comment on attachment 332559 [details] Patch Clearing flags on attachment: 332559 Committed r227745: <https://trac.webkit.org/changeset/227745>
All reviewed patches have been landed. Closing bug.
<rdar://problem/36995062>