r277913 Caused multiple layout-test crash on mac debug queues. e.g.: https://results.webkit.org/?suite=layout-tests&suite=layout-tests&test=accessibility%2Faccessibility-crash-focused-element-change.html&test=accessibility%2Faccessibility-crash-setattribute.html
Crash log: https://build.webkit.org/results/Apple-BigSur-Debug-AppleSilicon-WK1-Tests/r277913%20(1673)/accessibility/accessibility-crash-focused-element-change-crash-log.txt 2 0x124496960 WebCore::JSANGLEInstancedArrays::createPrototype(JSC::VM&, WebCore::JSDOMGlobalObject&) 3 0x1264af754 WebCore::DatabaseTracker::openTrackerDatabase(WebCore::DatabaseTracker::TrackerCreationAction) 4 0x1264b12d4 WebCore::DatabaseTracker::origins() 5 0x1264b32cc WebCore::DatabaseTracker::deleteAllDatabasesImmediately() 6 0x13fecd3e4 -[WebDatabaseManager deleteAllDatabases]
*** This bug has been marked as a duplicate of bug 226140 ***
Reverted r277913 in https://bugs.webkit.org/show_bug.cgi?id=226140