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This reverts commit c0c53eb2.

Reason for revert: breaks compilation when is_chrome_branded=true
OobeBaseTest::kFakeUserEmail is referenced at:
https://cs.chromium.org/chromium/src/chrome/browser/chromeos/login/sync_consent_interactive_ui_test.cc?l=141&rcl=95ffa536956a89b861c39e6df1c8670638dd31a0

https://cs.chromium.org/chromium/src/chrome/test/BUILD.gn?l=2010&rcl=80199d3ea8218c1e8568bcc087c6d77f0ebaf94e

Original change's description:
> cros: Make FakeGaia in OobeBaseTest a mixin
>
> We may want to just use FakeGaia directly instead of introducing a
> mixin, but that can be decided later. For now let's focus on simplifying
> all of the test bases.
>
> Bug: 912704
> Change-Id: Id4a7ab8e0c23343b7e6e59c7b7d2aefc16891515
> Reviewed-on: https://chromium-review.googlesource.com/c/1366895
> Commit-Queue: Jacob Dufault <jdufault@chromium.org>
> Reviewed-by: Sergey Poromov <poromov@chromium.org>
> Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
> Reviewed-by: Alexander Alekseev <alemate@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#635236}

TBR=antrim@chromium.org,alemate@chromium.org,jdufault@chromium.org,poromov@chromium.org

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

Bug: 912704
Change-Id: I31882d938465fb8404c90b84379e34aff7354512
Reviewed-on: https://chromium-review.googlesource.com/c/1490353Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635836}