Revert "Add "own" symbols support."

This reverts commit r23056 for breaking Mac x64 test.

TBR=verwaest@chromium.org

Review URL: https://codereview.chromium.org/460803003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23060 ce2b1a6d-e550-0410-aec6-3dcde31c8c00