Remove streamSpawnUri and mangler.

tests/isolate/nested_spawn_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.
+
+// Dart test program for testing that isolates can spawn other isolates.
+
+library NestedSpawnTest;
+import 'dart:isolate';
+import '../../pkg/unittest/lib/unittest.dart';
+
+void isolateA() {
+  IsolateSink replyTo;
+  bool isFirst = true;
+  stream.listen((msg) {
+    if (isFirst) {
+      isFirst = false;
+      replyTo = msg;
+      return;
+    }
+    expect(msg, "launch nested!");
+    IsolateSink sink = streamSpawnFunction(isolateB);
+    MessageBox box = new MessageBox();
+    sink.add(box.sink);
+    sink.add("alive?");
+    box.stream.single.then((msg) {
+      expect(msg, "and kicking");
+      replyTo.add(499);
+      replyTo.close();
+      stream.close();
+    });
+  });
+}
+
+void isolateB() {
+  IsolateSink replyTo;
+  bool isFirst = true;
+  stream.listen((msg) {
+    if (isFirst) {
+      isFirst = false;
+      replyTo = msg;
+      return;
+    }
+    expect(msg, "alive?");
+    replyTo.add("and kicking");
+    replyTo.close();
+    stream.close();
+  });
+}
+
+
+main() {
+  test("spawned isolates can spawn nested isolates", () {
+    MessageBox box = new MessageBox();
+    IsolateSink sink = streamSpawnFunction(isolateA);
+    sink.add(box.sink);
+    sink.add("launch nested!");
+    box.stream.single.then(expectAsync1((msg) {
+      expect(msg, 499);
+    }));
+  });
+}