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This patch marks DialogClientViewTest.ButtonPosition flaky on Mac.

TBR=bsep@chromium.org

Bug: 903000
Change-Id: I7d533956e437c143e4d4030dd357553fd4caabf1
Reviewed-on: https://chromium-review.googlesource.com/c/1325592Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606338}