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The test fails due to a race of UkmRecorder::AddEntry with DOMMessageQueue::Observe:
https://cs.chromium.org/chromium/src/services/metrics/public/cpp/delegating_ukm_recorder.cc?q=src/services/metrics/public/cpp/delegating_ukm_recorder.cc&sq=package:chromium&g=0&l=137

Bug: 880217
Change-Id: Icf099c3eb1094d8a571dc6f87b152e3c838807dc
Reviewed-on: https://chromium-review.googlesource.com/1204011Reviewed-by: Tommi <tommi@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589317}