Remove HandleScope default ctor.

BUG=chromium:236173
R=bmeurer@chromium.org, svenpanne@chromium.org

Review URL: https://codereview.chromium.org/23530045

Patch from Marja Hölttä <marja@chromium.org>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16605 ce2b1a6d-e550-0410-aec6-3dcde31c8c00