The intent of these calls was to properly key the WeakMap get/set calls
on the underlying global object, not the proxy, since that is the object
actually being observed. But unwrapping at this layer is unnecessary
since GetIdentityHash will already do the unwrapping (via its call to
GetHiddenProperty).
Also remove the runtime function itself, as these were the only callers,
and remove the now-redundant IS_SPEC_OBJECT() checks from object-observe.js's
MapWrapper type.
R=verwaest@chromium.org
Review URL: https://codereview.chromium.org/234143002
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20740 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
c1db31b97c