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Mitigate this issue: make the thread_bundle RunUntilIdle when tearing
down these unittests. See crbug.com/943570#c7 for rationale.

No-try: true
Bug: 943570
Change-Id: Ib8df70054ea9de3d7277da0b49e8885bf103b44a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1530385Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#642405}