Disable weak embedded maps because of crashes.

R=mstarzinger@chromium.org
BUG=172489,217858

Review URL: https://chromiumcodereview.appspot.com/12805006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14010 ce2b1a6d-e550-0410-aec6-3dcde31c8c00