Revert "Trigger exception debug event for promises at the throw site."

This reverts r21092.

R=ishell@chromium.org

Review URL: https://codereview.chromium.org/262533009

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21094 ce2b1a6d-e550-0410-aec6-3dcde31c8c00