Remove StreamController.broadcast.

tests/lib/async/stream_controller_async_test.dart

 // Copyright (c) 2011, 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 the basic StreamController and StreamController.singleSubscription.
 library stream_controller_async_test;
 
 import "package:expect/expect.dart";
 import 'dart:async';
 import 'dart:isolate';
 import '../../../pkg/unittest/lib/unittest.dart';
 import 'event_helper.dart';
 
 testController() {
   // Test fold
   test("StreamController.fold", () {
-    StreamController c = new StreamController.broadcast();
-    Stream stream = c.stream;
+    StreamController c = new StreamController();
+    Stream stream = c.stream.asBroadcastStream();
     stream.fold(0, (a,b) => a + b)
      .then(expectAsync1((int v) {
         Expect.equals(42, v);
     }));
     c.add(10);
     c.add(32);
     c.close();
   });
 
   test("StreamController.fold throws", () {
-    StreamController c = new StreamController.broadcast();
-    Stream stream = c.stream;
+    StreamController c = new StreamController();
+    Stream stream = c.stream.asBroadcastStream();
     stream.fold(0, (a,b) { throw "Fnyf!"; })
      .catchError(expectAsync1((e) { Expect.equals("Fnyf!", e.error); }));
     c.add(42);
   });
 }
 
 testSingleController() {
   test("Single-subscription StreamController.fold", () {
     StreamController c = new StreamController();
     Stream stream = c.stream;
@@ skipping 378 matching lines @@
   testFuture("fold", (s, act) => s.fold(0, (a,b) => act(b)));
 }
 
 main() {
   testController();
   testSingleController();
   testExtraMethods();
   testPause();
   testRethrow();
 }