[Gecko Bug 1652155] Fix document check in Document::TopLayerPop. #24573
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Top layer / fullscreen should work in shadow dom. This check is off
compared to literally every other fullscreen check.
The test is pretty gross, but not my fault, see the comment in there :)
Differential Revision: https://phabricator.services.mozilla.com/D83198
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1652155
gecko-commit: 0ed90c257ebde84e9503203b820f2863292fb650
gecko-integration-branch: autoland
gecko-reviewers: edgar