GitLab

Improve the fingerprint setup tests by making OobeBaseTest
the base class of FingerprintSetupTest. OobeBaseTest waits for the
OOBE UI to be ready before any tests are run.

Tested locally.

Bug: 1009916
Change-Id: I6147a27d501ecf81f9ce15173af617afca24b3a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863015Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Renato Silva <rrsilva@google.com>
Cr-Commit-Position: refs/heads/master@{#714199}