set JSRuntime max memory size to match what xulrunner does
set JSRuntime max memory size to match what xulrunner does

This prevents frequent out-of-memory crashes. We aren't sure
yet we understand exactly what we should do long-term:
http://bugzilla.gnome.org/show_bug.cgi?id=562575

pixunil/cjs,pixunil/cjs,pixunil/cjs,mtwebster/cjs,mtwebster/cjs,endlessm/gjs,endlessm/gjs,joeshaw/gjs,djdeath/gjs,mtwebster/cjs,endlessm/gjs,djdeath/gjs,mtwebster/cjs,djdeath/gjs,joeshaw/gjs,magcius/gjs,mtwebster/cjs,endlessm/gjs,djdeath/gjs,djdeath/gjs,pixunil/cjs,magcius/gjs,magcius/gjs,joeshaw/gjs,endlessm/gjs,magcius/gjs,pixunil/cjs,joeshaw/gjs,magcius/gjs,joeshaw/gjs