f71315eb1e52d40fd3aa291f05ac09aaf6bbd8b0

Commit 7e66d2a484
killed off META_CORE_GET_FRAME_TYPE, but got
the replacement wrong - MetaWindowType is an enum like MetaFrameType,
but the two are not interchangeable.
https://bugzilla.gnome.org/show_bug.cgi?id=742841
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