bindings: Retires template functions in DOMDataStore, V8DOMWrapper.

The original functions without "NonTemplate" suffix are removed by this CL.
A following CL will remove "NonTemplate" suffix from the new functions.

BUG=235436

Review URL: https://codereview.chromium.org/692803002

git-svn-id: svn://svn.chromium.org/blink/trunk@184960 bbb929c8-8fbe-4397-9dbb-9b2b20218538