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This change disables the
MessagePopupCollectionTest.UpdateContentsCausePopupClose on MacOS due to
the MacOS 10.10 builder failing it.

Bug: 1047503

TBR=xidachen@chromium.org,dewittj@chromium.org,estade@chromium.org,peter@chromium.org,yoshiki@chromium.org,tengs@chromium.org

Change-Id: I58ea2274b0c00bb0fc176cd30dc6a34780a783b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031856Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Commit-Queue: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737105}