Drop sessionID / websiteDataStoreID from WebPageCreationParameters now that we have one session per WebProcess.
Created attachment 378909 [details] Patch
Comment on attachment 378909 [details] Patch Clearing flags on attachment: 378909 Committed r249939: <https://trac.webkit.org/changeset/249939>
All reviewed patches have been landed. Closing bug.
<rdar://problem/55426284>