The ApiGetterEntryStub is not implemented on arm or x64, but the
platform-specific implementations need to change to match the change
to the platform-independent signatures.

TBR=ager@chromium.org

Review URL: http://codereview.chromium.org/471009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3441 ce2b1a6d-e550-0410-aec6-3dcde31c8c00