Memcache is already off but now it's not in the code anymore.
This includes removing domain creation failfast, since that is actually
slower now than just running the flow - all you gain is a non-transactional
read over a transactional read, but the cost is that you always pay that
read, which is going to drive up latency.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=158183506
By duplicating rather than moving them, I can keep both versions
around while I port the flows over to the new flat form.
I could have made these g4 moves from the original sources, but
there's barely anything in these files and it didn't really seem
like it was adding anything useful.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=132999387