- Move GetHiddenProperties functionality from object.cc to handle.cc to
  be more robust in the presence of GC in the middle of the function.

Review URL: http://codereview.chromium.org/115267

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1924 ce2b1a6d-e550-0410-aec6-3dcde31c8c00