Try to make MSVC happy about EscapableHandleScope.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/25077002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16994 ce2b1a6d-e550-0410-aec6-3dcde31c8c00