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These tests don't work when using a Mac printing dialog with MacViews, because
the modal closure animation makes window closure very asynchronous. Disable
it altogether in this set of tests.

Bug: 817408
Change-Id: Idb1bd814e9248e0cbd8d07e3426084c72db06d65
Reviewed-on: https://chromium-review.googlesource.com/975521Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545089}