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
This changes the containerful scrolling pref to be an override pref such that it is: - always false on desktop (i.e. always use containerless there) - always true in Fennec (i.e. never use containerless there) - true in GeckoView if WebRender is disabled (i.e. only use containerless with WebRender). The first two cases are the same as before; the last case is new. Because we don't create layers with WR, the containerless vs containerful distinction doesn't make much sense there, and we need to implement a bunch of zooming glue in either case. So it makes sense to go with the "way of the future" and keep it containerless. Differential Revision: https://phabricator.services.mozilla.com/D8733 --HG-- extra : moz-landing-system : lando