Observatory now uses websockets to communicate with the vm.

tests/standalone/vmservice/websocket_client_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library unknown_command_test;
 
 import 'test_helper.dart';
 import 'package:expect/expect.dart';
 
 class ClientsRequestTest extends ServiceWebSocketRequestHelper {
@@ skipping 12 matching lines @@
       _count++;
     }
     if (_count == 2) {
       // After receiving both responses, the test is complete.
       complete();
     }
   }
 
   runTest() {
     // Send a request for clients with 'cli' sequence id.
-    sendMessage('cli', ['clients']);
+    sendMessage('cli', 'clients');
     // Send a request for vm info with 'vm' sequence id.
-    sendMessage('vm', ['vm']);
+    sendMessage('vm', 'vm');
   }
 }
 
 main() {
   var process = new TestLauncher('unknown_command_script.dart');
   process.launch().then((port) {
     new ClientsRequestTest(port).connect().then((test) {
       test.completed.then((_) {
         process.requestExit();
       });
       test.runTest();
     });
   });
 }