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Uses a combination of share-specific values (user hash, URL, source,
authentication type, workgroup & username) as input to a SHA256 hash
that is then used to create a mount path that does not change across
mount / unmount cycles.

Test: unit_tests --gtest_filter="*SmbFs*"
Test: Deploy to DUT, ensure SMB share mounts successfully
Test: Mount share, unmount, remount, ensure mount path remains constant
Bug: 1130884
Change-Id: I24603cc9d09609e65c3b869c3c42142c30425788
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2430539
Commit-Queue: Josh Simmons <simmonsjosh@google.com>
Reviewed-by: Anand K Mistry <amistry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815026}