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According to the flakiness dashboard, layout test virtual/gpu/fast/canvas/
canvas-imageSmoothingQuality.html is now passing on Linux and Win, but still
failing on Mac trybots:

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=webkit_tests&tests=virtual%2Fgpu%2Ffast%2Fcanvas%2Fcanvas-imageSmoothingQuality.html

This CL updates the fail tag to reflect this behavior.

Bug: 693568
Change-Id: Ibd2974c9c02706d0ad5d6b0c342e2dc1112ead34
TBR: junov@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/768948Reviewed-by: Mohammad Reza Zakerinasab <zakerinasab@chromium.org>
Commit-Queue: Mohammad Reza Zakerinasab <zakerinasab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516338}