HashTable::Shrink() handlified and derived template parameter added to HashTable hierarchy.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/234663004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20697 ce2b1a6d-e550-0410-aec6-3dcde31c8c00