[Gecko Bug 1562701] Move the reframing logic of <details> element into WipeContainingBlock. #17788
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We don't need to treat a details frame as if it has multiple content
insertion points in order to reframe it. We can just put the logic into
WipeContainingBlock().
The reftests layout/reftests/details-summary/dynamic-add-*.html also
cover adding
Differential Revision: https://phabricator.services.mozilla.com/D36529
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1562701
gecko-commit: 10faf756124c232c9b460afc72168ea54fa6ab03
gecko-integration-branch: central
gecko-reviewers: dbaron