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The PolicyCertService tracks which Profile has used a policy provided
trust anchor by the user's email address.

This CL fixes an issue in which the stored data is queried by the
username hash instead of the email.

Bug: 1106441
Test: unit test
Change-Id: I0e0402f39068fbbc1b218cde0684c4fe6c1a880e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2413489Reviewed-by: Andreea-Elena Costinas <acostinas@google.com>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Commit-Queue: Andreea-Elena Costinas <acostinas@google.com>
Cr-Commit-Position: refs/heads/master@{#809274}