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This moves //chromeos/cryptohome from //chromeos public_deps to deps
so that other components (chrome, ash, extensions, arc) must depend
on it explicitly.

This will also allow the dependency to be removed from src/ash.

For explicit dependency add to components/arc/BUILD.gn:
TBR=hidehiko@chromium.org

Bug: 918682
Change-Id: I660aedbdb04b4edd9f6308d27135be9d5aab8276
Reviewed-on: https://chromium-review.googlesource.com/c/1394865
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619995}