Remove streamSpawnUri and mangler.

tests/isolate/compute_this_script_browser_stream_test.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.
 
 // Test that spawn works even when there are many script files in the page.
 // This requires computing correctly the URL to the orignal script, so we can
 // pass it to the web worker APIs.
 library compute_this_script;
 
 import 'dart:html';
 import 'dart:isolate';
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 
 child() {
-  port.receive((msg, reply) {
-    reply.send('re: $msg');
-    port.close();
+  var sink;
+  stream.listen((msg) {
+    sink = msg;
+  }, onDone: () {
+    sink.add("done");
+    sink.close();
   });
 }
 
 main() {
   useHtmlConfiguration();
   var script = new ScriptElement();
   document.body.append(script);
   test('spawn with other script tags in page', () {
-    ReceivePort port = new ReceivePort();
-    port.receive(expectAsync2((msg, _) {
-      expect(msg, equals('re: hi'));
-      port.close();
+    var box = new MessageBox();
+    box.stream.listen(expectAsync1((msg) {
+      expect(msg, equals("done"));
     }));
 
-    SendPort s = spawnFunction(child);
-    s.send('hi', port.toSendPort());
+    IsolateSink s = streamSpawnFunction(child);
+    s.add(box.sink);
+    s.close();
   });
 }