Fix WeakMaps leak http://codereview.appspot.com/6495105
Fix WeakMaps leak
http://codereview.appspot.com/6495105

Prevents the reading of any WeakMap hidden record irrespective of the frame in which the WeakMap originates

R=felix8a@gmail.com


git-svn-id: eb21526166532bd3afc2c1499c0cf105ce815f5a@5039 360991c0-9f3b-0410-ba87-8b362a00edf4

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