Fixed skipping_dart2js_compilations_test after changing Command() constructor

tests/standalone/io/test_runner_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.
 
 import "dart:io";
 import "dart:isolate";
 import "dart:async";
 import "dart:utf";
 import "../../../tools/testing/dart/test_runner.dart";
 import "../../../tools/testing/dart/test_suite.dart";
@@ skipping 53 matching lines @@
     enqueueTestCase(testCaseFail);
     enqueueTestCase(testCaseTimeout);
     enqueueTestCase(testCaseFailUnexpected);
 
     if (onDone != null) {
       onDone();
     }
   }
 
   TestCase _makeNormalTestCase(name, expectations) {
-    var command = new Command(Platform.executable,
+    var command = new Command('custom',
+                              Platform.executable,
                               [Platform.script, name]);
     return _makeTestCase(name, DEFAULT_TIMEOUT, command, expectations);
   }
 
   _makeCrashTestCase(name, expectations) {
-    var crashCommand = new Command(getProcessTestFileName(),
+    var crashCommand = new Command('custom_crash',
+                                   getProcessTestFileName(),
                                    ["0", "0", "1", "1"]);
     // The crash test sometimes times out. Run it with a large timeout
     // to help diagnose the delay.
     // The test loads a new executable, which may sometimes take a long time.
     // It involves a wait on the VM event loop, and possible system
     // delays.
     return _makeTestCase(name, LONG_TIMEOUT, crashCommand, expectations);
   }
 
   _makeTestCase(name, timeout, command, expectations) {
@@ skipping 31 matching lines @@
         break;
       case 'timeout':
         // Run for 10 seconds, then exit.  This tests a 2 second timeout.
         new Timer(new Duration(seconds: 10), (){ });
         break;
       default:
         throw "Unknown option ${arguments[0]} passed to test_runner_test";
     }
   }
 }