Make sure window.frames == window. This is a dumb little bug Chromium had way back when, that no other tests caught (at least not identifiably).
Created attachment 28253 [details] New test + result It seems really silly to have such a tiny test, but I can't find any good one to add it to. Suggestions more than welcome.
Comment on attachment 28253 [details] New test + result LGTM
Landed in r41436.