Add support for empty hydrogen filter that matches only the top-level JSFunction.

BUG=

Review URL: https://codereview.chromium.org/19590002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15729 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Handlify JSReceiver/JSObject::DeleteProperty method.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/18774002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15730 ce2b1a6d-e550-0410-aec6-3dcde31c8c00