Comment #22 on issue 3134 by [email protected]: Patch: Removes the translate_axis call from axis-group-interface outside-staff positioning.
http://code.google.com/p/lilypond/issues/detail?id=3134
The line (or at least the lack of an interface) was there to start with. When the measure-counter.ly regtest became part of LilyPond, these programming errors were there. So the line was (I think) always in the log.
