Keep CHROME_TOOLBAR / window.toolbar.visible to distinguish popup-like
windows, and remove the rest, we really don't need all combinations.
The only window that had weird mixes are taskbar tabs, which already had
their own attribute to do this. Gecko doesn't need to know about all the
specific toolbars.
Differential Revision: https://phabricator.services.mozilla.com/D319805
Emilio Cobos Álvarez
240636d9a5