Adding these local properties on all native functions made us do a
ConvertDescriptorToField on the callback on each and every native
functions, resulting in us creating an extra map for each of these.
Review URL: http://codereview.chromium.org/7779046

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9152 ce2b1a6d-e550-0410-aec6-3dcde31c8c00