Ignore default reject handler when looking for reject handlers.

LOG=N
BUG=v8:3093
R=aandrey@chromium.org

Review URL: https://codereview.chromium.org/461023002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23112 ce2b1a6d-e550-0410-aec6-3dcde31c8c00