Focus should not take into account scroll margin for visibility check
<rdar://problem/99840839>
Pull request: https://github.com/WebKit/WebKit/pull/4284
Committed 254732@main (f121c13339f2): <https://commits.webkit.org/254732@main> Reviewed commits have been landed. Closing PR #4284 and removing active labels.
Committed 252432.631@safari-7614-branch (18fc4f8a6430): <https://commits.webkit.org/252432.631@safari-7614-branch> Reviewed commits have been landed. Closing PR #152 and removing active labels.