It seems a recent change has unintentionally enabled WebInspectorUI on Apple Win. Address this by explicitly disabling it.
<rdar://problem/74590803>
Created attachment 421868 [details] Patch
Comment on attachment 421868 [details] Patch r=me
Comment on attachment 421868 [details] Patch Thanks for reviewing!
Committed r273699: <https://commits.webkit.org/r273699> All reviewed patches have been landed. Closing bug and clearing flags on attachment 421868 [details].