Remove hybi sub directory for WebSocket layout tests

LayoutTests/http/tests/websocket/alert-in-event-handler-expected.txt

 ALERT: waiting for open
 ALERT: message handled.first message
 ALERT: message handled.second message
 Make sure event handler called serially.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 alert will suspend/resume WebSocket.
 onopen should fire later.
 Connected
 Enter onmessage: first message
 Leave onmessage: first message
 Enter onmessage: second message
 Leave onmessage: second message
 Closed
 PASS successfullyParsed is true
 
 TEST COMPLETE