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Ash has a transitive dependency on the device fingerprint service, so
the test-only ash_shell_with_content won't start up without
declaring that requirement.

Bug: none
Test: run ash_shell_with_content, it starts
Change-Id: Id8acd41c154738a9470b8b19f63da93fede1740f
Reviewed-on: https://chromium-review.googlesource.com/c/1329623Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606910}