Disable DumpAccessibilityTreeTest.AccessibilityAomChecked  on TSAN

Failures:
https://build.chromium.org/p/chromium.memory/builders/Linux%20TSan%20Tests/builds/3704

Root cause:
https://codereview.chromium.org/2787843003
RunAomTest() try to override the global feature list after the browser
test is setup, causing a race condition with a read from the network
thread.

BUG=708759
TBR=dmazzoni

Review-Url: https://codereview.chromium.org/2797363002
Cr-Commit-Position: refs/heads/master@{#462252}
1 file changed