Delete obsolete JSArray allocation functions.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/24202003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16791 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Unify load handling into CanLoad and Load.

R=titzer@chromium.org

Review URL: https://chromiumcodereview.appspot.com/24088003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16792 ce2b1a6d-e550-0410-aec6-3dcde31c8c00