It wasn't being used by any actual code, and having helper methods handling
saving/persistence on entities like this is not a pattern we want to encourage,
since it hides Datastore transactions from further up in the call chain. The
idea is that you can always look for ofy() calls in the same layer of code to
see where persisted data is being changed.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=143036027