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The final status flag is determined by the transfer status. Additionally
this CL adds a Clone() method to TransferMetadataBuilder to be able to
update fields from already build TransferMetadata objects.

Bug: 1085067
Change-Id: Ie4a3cb335897f477329bc21189c33530ee7848ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2349848Reviewed-by: Alex Chau <alexchau@chromium.org>
Commit-Queue: Richard Knoll <knollr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797243}