Rollback of r16040 in trunk branch.

Make GlobalHandle::NodeBlock deletable

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/22343003

git-svn-id: https://v8.googlecode.com/svn/trunk@16104 ce2b1a6d-e550-0410-aec6-3dcde31c8c00