[Gecko Bug 1585882] Fix needs_frame() check to account for the case where an ancestor of us has been reconstructed regularly, not via lazy frame construction. #19535
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This is a pre-existing bug, and this would be enough to fix the website, but
this is still not 100% correct. More on that in a second.
Differential Revision: https://phabricator.services.mozilla.com/D48134
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1585882
gecko-commit: df80909c82323e153691e01b3a15d19f4929cba0
gecko-integration-branch: autoland
gecko-reviewers: heycam