Revert "This patch implements optimized objectInfo structure which manages the set of observers associated with an object and the changeRecord types which they accept."

This reverts r16539 as it triggers crashes on the GC stress bot.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16540 ce2b1a6d-e550-0410-aec6-3dcde31c8c00