[Sheriff] Disable DumpAccessibilityTreeTest.AccessibilitySource

Tbr: dmazzoni@chromium.org
Bug: 921162
Change-Id: Ibf093d6bfa8444f2936e5ae56d53f26834b6b809
Reviewed-on: https://chromium-review.googlesource.com/c/1407653
Reviewed-by: Adithya Srinivasan <adithyas@chromium.org>
Commit-Queue: Adithya Srinivasan <adithyas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622187}
1 file changed