defined in JavaScript code by using __defineGetter__ and
__defineSetter__.

Also, disable access checks when configuring objects created from
templates.
Review URL: http://codereview.chromium.org/8914

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@656 ce2b1a6d-e550-0410-aec6-3dcde31c8c00