fast/events/simulated-key-state.html is failing on release try bots too.

BUG=250970
TBR=dcheng@chromium.org

Review URL: https://codereview.chromium.org/21001006

git-svn-id: svn://svn.chromium.org/blink/trunk@155147 bbb929c8-8fbe-4397-9dbb-9b2b20218538