In the great flow flattening, ResourceFlowUtils grew a couple nice helpers
for rebuilding transferrable resources (Domains and Contacts) upon the
resolution of a transfer - approvePendingTransfer() and denyPendingTransfer().
Most transfer-resolving callsites use one of these two helpers, but for legacy
reasons the deletion flows (DomainDeleteFlow and DeleteContactsAndHostsAction)
were instead using the "manual" resolvePendingTransfer() method or its even more
low-level createResolvedTransferData() helper instead of denyPendingTransfer().
It's simpler to just have two options - approve and deny - so this CL inlines
createResolvedTransferData() into resolvePendingTransfer() and makes the latter
a private helper for the approve/denyPendingTransfer() public helpers.
This CL also adds sanity checks that approve/denyPendingTransfer() are called
only with the logically appropriate values of TransferStatus.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=170819358
fd62f4a74e