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Removed unit tests use Directory implementation of Nigori and cover
Directory behavior.

Bug: 1083924
Change-Id: I11a368874dc3163866c371f7e15d362ce35bcce4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225397
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774095}