Fix test harness for running vm tests in runtime directory.

tools/test-runtime.dart

 #!/usr/bin/env dart
 // Copyright (c) 2012, 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.
 
 // TODO(ager): Get rid of this version of test.dart when we don't have
 // to worry about the special runtime checkout anymore.
 // This file is identical to test.dart with test suites in the
 // directories samples, client, compiler, and utils removed.
 
@@ skipping 95 matching lines @@
     if (runningBrowserTests) startHttpServer('127.0.0.1', 9876);
   }
 
   // Start process queue.
   new ProcessQueue(
       maxProcesses,
       progressIndicator,
       startTime,
       printTiming,
       enqueueConfiguration,
-      () => terminateHttpServer(),
+      () => TestingServerRunner.terminateHttpServers(),
       verbose,
       listTests);
 }