[Gecko Bug 1580381] Fix document.open tests to align with HTML spec changes. #19732
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See whatwg/html#4723
Differential Revision: https://phabricator.services.mozilla.com/D45478
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1580381
gecko-commit: 35a2a50ef074234912f5f1ad112a424608360d40
gecko-integration-branch: autoland
gecko-reviewers: hsivonen