LocalStorageDatabaseTracker does not need to subclass ThreadSafeRefCounted, it is only ref'd / deref'd by the StorageArea on the com.apple.WebKit.WebStorage serial WorkQueue, and in LocalStorageDatabase::scheduleDatabaseUpdate() on the same WorkQueue.
Created attachment 376519 [details] Patch
Comment on attachment 376519 [details] Patch r=me
Created attachment 376526 [details] Patch
Comment on attachment 376526 [details] Patch Clearing flags on attachment: 376526 Committed r248794: <https://trac.webkit.org/changeset/248794>
All reviewed patches have been landed. Closing bug.
<rdar://problem/54406074>