Protect WebProcessPool from null weak pointers in m_serviceWorkerProcesses map
<rdar://problem/58285589>
Created attachment 391551 [details] Patch
Comment on attachment 391551 [details] Patch Clearing flags on attachment: 391551 Committed r257222: <https://trac.webkit.org/changeset/257222>
All reviewed patches have been landed. Closing bug.