Replace all instances of Element::computeInheritedLanguage with Element::effectiveLang.
Pull request: https://github.com/WebKit/WebKit/pull/3446
Committed 253624@main (4cae97e20519): <https://commits.webkit.org/253624@main> Reviewed commits have been landed. Closing PR #3446 and removing active labels.
<rdar://problem/98932288>