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This test became unacceptably flaky with the upgrade to 10.13.6.

Tbr: ynovikov@chromium.org
Bug: 872423
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I8fded8d47792dce57ea6da6532f7d42b5c075bd4
Reviewed-on: https://chromium-review.googlesource.com/1172148Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582492}