This allows us to remove the #ifdef MOZ_ENABLE_WEBRENDER for the advanced layers
prefs from all.js. As additional advanced layers are turned on for webrender (or
non-webrender) they can be converted into override prefs without affecting the
call sites.
MozReview-Commit-ID: F9tMc23ow8A
--HG--
extra : rebase_source : 2244cb000711496ce5b7f1b50ef0314e1c312d94