Remove deprecated functions and deprecated Script::GetId (which was supposed to
be deprecated, but Chrome was using it).

R=dcarney@chromium.org, svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/315003003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21695 ce2b1a6d-e550-0410-aec6-3dcde31c8c00