Don't try to connect to "ws://"+location.host+"/" in WebSocket tests.

This will connect on port 80, which is not typically under the control of the
wpt server.

tests/wpt/web-platform-tests/websockets/constructor/005.html

@@ -6,6 +6,6 @@
 <div id=log></div>
 <script>
 test(function() {
-  assert_true(new WebSocket("ws://"+location.host+"/") instanceof WebSocket);
+  assert_true(new WebSocket(SCHEME_DOMAIN_PORT + '/empty-message') instanceof WebSocket);
 });
 </script>