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When files transfer progress details was managed by a feature flag,
there was a run-time support function called isTransferDetailsEnabled().

Remove the utility function and all references to it.

Remove the now obsolete function generateDestinationString_().

Bug: 953308
Change-Id: Ia011cba72621187d3c5e74af25ec5cb32789482f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600427
Commit-Queue: Alex Danilo <adanilo@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839062}