Disable top level serialization under harmony_scoping. It has broken tests.

TBR=yangguo@chromium.org

Review URL: https://codereview.chromium.org/717143002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25293 ce2b1a6d-e550-0410-aec6-3dcde31c8c00