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Mixin extracted from the Eula browsertests.
Mixin to be reused for the OobeEndToEnd tests.
Also removed DISABLED on MSAN code - covered by oobe msan filters.

Bug: 1032194, 1041188
Change-Id: I96e192dd86f59e4634779d824898c3097cf18d03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343074Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Auto-Submit: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796009}