[Chromium/Mac] Layout Test fast/events/invalid-001.html,invalid-002.html,invalid-003 are flaky crash

[Fumitoshi Ukai]

The following layout test is flaky crash on Chromium Mac

fast/events/invalid-001.html
fast/events/invalid-002.html
fast/events/invalid-003.html


Probable cause:
http://trac.webkit.org/log/?verbose=on&rev=110246&stop_rev=110170

http://test-results.appspot.com/dashboards/flakiness_dashboard.html#showExpectations=true&tests=fast%2Fevents%2Finvalid-001.html%2Cfast%2Fevents%2Finvalid-002.html%2C%2Cfast%2Fevents%2Finvalid-003.html&group=%40DEPS%20-%20chromium.org

[Kent Tamura]

They are't failing on Canary bots.  I'm afraid the DEPS bots are sick.

[Fumitoshi Ukai]

seems fast/events/invalid-04.html and fast/events/invalid-05.html are also flaky?
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=fast%2Fevents%2Finvalid-001.html%2Cfast%2Fevents%2Finvalid-002.html%2Cfast%2Fevents%2Finvalid-003.html%2Cfast%2Fevents%2Finvalid-004.html%2Cfast%2Fevents%2Finvalid-005.html%2C


it also happens on @ToT - webkit.org

http://test-results.appspot.com/dashboards/flakiness_dashboard.html#group=%40ToT%20-%20webkit.org&tests=fast%2Fevents%2Finvalid-001.html%2Cfast%2Fevents%2Finvalid-002.html%2Cfast%2Fevents%2Finvalid-003.html%2Cfast%2Fevents%2Finvalid-004.html%2Cfast%2Fevents%2Finvalid-005.html%2C

[Ryosuke Niwa]

No longer reproduces.