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This CL removes DirectoryCryptographer and its last usages.

Bug: 1083924
Change-Id: I800c9aee00c1f35e81fc177bf835ea76916bd760
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2228553
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779338}