We should also rename SecureOriginData::isEmpty to SecureOriginData::isNull.
<rdar://problem/99146113>
Pull request: https://github.com/WebKit/WebKit/pull/3693
Committed 253835@main (12dcb9ef7891): <https://commits.webkit.org/253835@main> Reviewed commits have been landed. Closing PR #3693 and removing active labels.