This object just contained a pointer to the surface and dm,
and had one utility method.
Move the method to mw.editcheck, and pass around a surface model
or document model to other methods as appropriate.
Change-Id: Ie81d76dea2823b633328f982ee20027808bfc8e3
This method is highly specific to reference insertion. If we ever need
it for another check it can be moved back with a more specific name.
Change-Id: Ia629c8672281f33d45ea1fff6630af9bd331d80e
Replace it with a hasAddedContentNeedingReference that'll need to be
kept in-sync with the internal logic in AddReferenceEditCheck while
we're tagging this.
Follow-up to d69d366469.
Bug: T367920
Change-Id: I9f4f96bf5c6c4b7b3131b1435426b2e283c9833a
