DevTools: Fix broken console evaluation after overriding Error object.

BUG=427173
R=yurys, pfeldman

Review URL: https://codereview.chromium.org/683483002

git-svn-id: svn://svn.chromium.org/blink/trunk@184540 bbb929c8-8fbe-4397-9dbb-9b2b20218538