Deprecate old versions of Isolate::SetData and GetData

BUG=none
R=svenpanne@chromium.org
LOG=y

Review URL: https://codereview.chromium.org/83363003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18021 ce2b1a6d-e550-0410-aec6-3dcde31c8c00