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 r16343 due to mjsunit object-observe failures on several bots:
  - V8 Linux nosse2
  - V8 GC stress 2

TBR=rossberg

Review URL: https://codereview.chromium.org/23491002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16344 ce2b1a6d-e550-0410-aec6-3dcde31c8c00