I can’t find any version info in that class either.
.....Big sigh…..
For my current company, we installed EE over a year a ago, and as far as I know, we’ve never updated these files. (I forgot about MSM being an expansion rather than intrinsic to EE) We are current on 1.6.6. I will get an update on the admin’s schedule. We’ve got to install it on the failover server, test it, then fail over. Install it on the live server, test it, then fail back over. Did I mention the sigh…..? 
Anyway, not your fault that we’re not up to date. I’ll probably wait for a while to update unless there is some huge security or risk of data loss.