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This flaky test is starting to fail due to timeouts. Accept this until
the underlying issue (i.e. shader logic) is fixed.

The original change (r507980) attempting to mark this test as Timeout
accidentally changed the line for
css3/filters/effect-reference-subregion.html instead.

TBR=yhirano@chromium.org, fs@opera.com
NOTRY=true

Bug: 773648, 658305
Change-Id: Ie52945d5158037e600ac24a04533d6d0efaecec9
Reviewed-on: https://chromium-review.googlesource.com/724224Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509579}