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One third of CQ runs of mash_browser_tests are failing when hitting the
NOTREACHED in Compositor:DidFailToInitializeLayerTreeFrameSink so I'm disabling
it while the cause is researched.

TBR=sadrul@chromium.org

TEST: mash_browser_tests
Bug: 742966, 743028
Change-Id: I9363ebfbdeac594d26696b5426004cbafcec9c9b
Reviewed-on: https://chromium-review.googlesource.com/571274Reviewed-by: Jonathan Ross <jonross@chromium.org>
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486771}