Make the internal parts of our external API a bit more const-correct.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/343583002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21891 ce2b1a6d-e550-0410-aec6-3dcde31c8c00