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Emilio Cobos Álvarez authored
It's not the kind of thing we want people to allow observing, generally, and even less so the kind of thing that we may want people to rely on. Move internal callers (all of them tests) to a new DOMWindowUtils.paintCount method. Differential Revision: https://phabricator.services.mozilla.com/D50817 --HG-- extra : moz-landing-system : lando
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