There were some tests that are supposed to protect against js messing
with the meta data, however, they just didn't try hard enough.

BUG=354967
R=dcarney@chromium.org
LOG=y

Review URL: https://codereview.chromium.org/215293005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20375 ce2b1a6d-e550-0410-aec6-3dcde31c8c00