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This CL refactors the ash implementation of
platformKeysInternal.getPublicKey into chromeos::platform_keys. This has
no intended behavior change for ash. This CL hooks up the crosapi
KeystoreService::GetPublicKey by forwarding to the same
chromeos::platform_keys implementation.

Change-Id: I19daa05727353c65ca072e365297c0e51f6d8b85
Bug: 1164523
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626044Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Michael Ershov <miersh@google.com>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843373}