This is only used by d8 if compiled with external data tables, or an
embedder that uses external data tables and v8's version of ICU.

BUG=none
R=svenpanne@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/210973007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20283 ce2b1a6d-e550-0410-aec6-3dcde31c8c00