Unreviewd. Fix break caused by using old internals.settings.setEnableCompositingForFixedPosition
(has been renamed to setAcceleratedCompositingForFixedPositionEnabled).

* compositing/layer-creation/no-compositing-for-fixed-position-under-transform.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@138856 268f45cc-cd09-0410-ab3c-d52691b4dbfc