[MERGE] Change the signature on VersionedFiles adapters to allow less typing and more flexability inside adapters.

[Robert Collins]

``VersionedFiles`` record adapters have had their signature change
from ``(record, record.get_bytes_as(record.storage_kind))`` to
``(record)`` reducing excess duplication and allowing adapters
to access private data in record to obtain content more
efficiently. (Robert Collins)

This reduces friction showing up in the
versionedfiles-for-network-streaming project I am working on with
Andrew.

-Rob
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