This code was just missed during the cleanup. There's maybe some merit
to keeping OneNewExtraM, but it would still be fairly optimistic. It's
trivial to bring back, so delete it for now.
Change-Id: I2d033c6daae787e0e8d6b92524f3e59610e2599f
Reviewed-on: https://go-review.googlesource.com/c/go/+/583375 Reviewed-by: Carlos Amedee <carlos@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>