Replace some more uses of dataParsoid and delete DOMUtils.dataParsoid

* There were a couple more uses of dataParsoid left around in
  DOMUtils in parallel to getDataParsoid.  Fixed and deleted
  the dataParsoid function.

* No change in parser tests results.

Change-Id: Ia97b05e6b98a7f8ee17d8d137926f3a6fe0b2379