Remove streamSpawnUri and mangler.

tests/isolate/count_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.
+
+library CountTest;
+import '../../pkg/unittest/lib/unittest.dart';
+import 'dart:isolate';
+
+void countMessages() {
+  int count = 0;
+  IsolateSink replySink;
+  bool isFirst = true;
+  stream.listen((msg) {
+    if (isFirst) {
+      replySink = msg;
+      isFirst = false;
+      return;
+    }
+    replySink.add(count);
+    count++;
+  }, onDone: () {
+    expect(count, 10);
+    replySink.close();
+  });
+}
+
+void main() {
+  test("count 10 consecutive stream messages", () {
+    int count = 0;
+    MessageBox box = new MessageBox();
+    IsolateSink remote = streamSpawnFunction(countMessages);
+    remote.add(box.sink);
+    box.stream.listen(expectAsync1((remoteCount) {
+      expect(remoteCount, count);
+      count++;
+      if (count < 10) {
+        remote.add(null);
+      } else {
+        remote.close();
+      }
+    }, count: 10), onDone: expectAsync0(() {
+      expect(count, 10);
+    }));
+    remote.add(null);
+  });
+}