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This reverts commit 6ab3c894.

Reason for revert: the project dependency, platform-side proxy, is
currently only enabled with device policy and not universally available
until M88.

Original change's description:
> remove cryptohome client from EnrollmentCertificateUploaderImpl
>
> The new attestation flow doesn't rely on cryptohome client anymore.
>
> as for testing, EnrollmentCertificateUploaderTest.* are passed.
>
> Change-Id: Id289cdc1b2e2d4a27179f048c0d6e3d4d968cd88
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303743
> Commit-Queue: Leo Lai <cylai@google.com>
> Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#789865}

TBR=emaxx@chromium.org,cylai@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: Ief64848511e08db9b9b6385c03d15f227a6cd2d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425685Reviewed-by: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Andreea-Elena Costinas <acostinas@google.com>
Commit-Queue: Leo Lai <cylai@google.com>
Cr-Commit-Position: refs/heads/master@{#810119}