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The default failure should not happen because of unprepared attestation;
instead it should controlled by thw allowlisting mechanism. Otherwise,
the retry logic could cause long testing time or even timeout.

As for testing, chromeos:chromeos_unittests and all affected
browser_tests are passed.

Bug: 1107426
Change-Id: Ie23d2618069b0511323d0f686a64ddfe0e05a054
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2308625Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Leo Lai <cylai@google.com>
Cr-Commit-Position: refs/heads/master@{#790343}