Rebaselined timeline-websocket-event-expected.txt after r157221

TBR=eustas,pfeldman

Review URL: https://codereview.chromium.org/23902006

git-svn-id: svn://svn.chromium.org/blink/trunk@157224 bbb929c8-8fbe-4397-9dbb-9b2b20218538