[Sheriff] Revert "Templatise type representation" and "Fix Mac warnings".

This reverts commit r18521 and r18522 for breaking mac and win builders.

BUG=
TBR=rossberg@chromium.org

Review URL: https://codereview.chromium.org/132493002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18524 ce2b1a6d-e550-0410-aec6-3dcde31c8c00