The change is needed to fix crashes in layout tests. For example: Crash log for http/tests/navigation/parsed-iframe-dynamic-form-back-entry.html https://build.webkit.org/results/Apple-BigSur-Debug-WK2-Tests/r272998%20(200)/http/tests/navigation/parsed-iframe-dynamic-form-back-entry-crash-log.txt
Created attachment 420749 [details] Patch
Committed r273064: <https://commits.webkit.org/r273064> All reviewed patches have been landed. Closing bug and clearing flags on attachment 420749 [details].
<rdar://problem/74465983>