The TypeOfStub didn't test the undetectable bit properly if the instance
was also callable, and therefore returned "object" for document.all
(which is both undetectable and callable).

R=yangguo@chromium.org
BUG=chromium:567998
LOG=n

Review URL: https://codereview.chromium.org/1527863003

Cr-Commit-Position: refs/heads/master@{#32852}