Code review comment for lp:~mwhudson/loggerhead/persist-_rev_info

It's not a big deal, but could somebody make this merge request... go
away? This branch wasn't merged into
less-stupid-whole-history-redundancy, but it *was* merged into
lp:loggerhead, so for all intents and purposes it's been dealt with. But
this request is still open, so it's still listed on the merge request
summary page.
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