CFRPageActions exists only to render these three templates, so it is removed
along with CFRMessageProvider, the CFR schemas, the
contextual-feature-recommendation popupnotification, the urlbar chiclet and their
stylesheets, plus MILESTONE_MESSAGE_87 now that the felt-privacy milestone
experiment detected no effect. ASRouter.observe() now calls
RemoteL10n.reloadL10n() directly instead of going through CFRPageActions, which
means the useRemoteL10n pref actually invalidates the l10n cache where the old
CFR-gated path never fired.
Differential Revision: https://phabricator.services.mozilla.com/D318365