Only start http server for browser tests.

tools/test.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.
 
 /**
  * This file is the entrypoint of the dart test suite.  This suite is used
  * to test:
  *
  *     1. the dart vm
@@ skipping 109 matching lines @@
       if (selectors.containsKey(name)) {
         queue.addTestSuite(
             new StandardTestSuite.forDirectory(conf, testSuiteDir));
       }
     }
   }
 
   // Start global http server that serves the entire dart repo.
   // The http server is available on localhost:9876 for any
   // test that needs to load resources from the repo over http.
-  if (!listTests) startHttpServer('127.0.0.1', 9876);
+  if (!listTests) {
+    // Only start the server if we are running browser tests.
+    var runningBrowserTests = configurations.some((config) {
+      return TestUtils.isBrowserRuntime(config['runtime']);
+    });
+    if (runningBrowserTests) startHttpServer('127.0.0.1', 9876);
+  }
 
   // Start process queue.
   new ProcessQueue(maxProcesses,
                    progressIndicator,
                    startTime,
                    printTiming,
                    enqueueConfiguration,
-                   () {
-                     if (!listTests) terminateHttpServer();
-                   },
+                   () => terminateHttpServer(),
                    verbose,
                    listTests);
 }