nrwt: remove fs refs from layout_package/json* modules
Created attachment 79501 [details] Patch
Committed r76200: <http://trac.webkit.org/changeset/76200>
Note that I committed a slight variation unreviewed to fix a couple of issues introduced by landing 52753 and not this one, as well as a couple of bugs that were revealed when I was testing this (all of which were causing build failures).