Suppress oilpan failures on http/tests/eventsource/workers/eventsource-simple.html

BUG=350616
TBR=oilpan-reviews@chromium.org

Review URL: https://codereview.chromium.org/189553004

git-svn-id: svn://svn.chromium.org/blink/trunk@168713 bbb929c8-8fbe-4397-9dbb-9b2b20218538