Redo StreamTransformers so they work with Stack traces.

tests/lib/async/catch_errors26_test.dart

 // Copyright (c) 2013, 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.
 
 import 'package:async_helper/async_helper.dart';
 import "package:expect/expect.dart";
 import 'dart:async';
 import 'catch_errors.dart';
 
 main() {
   asyncStart();
   Completer done = new Completer();
 
   var events = [];
   StreamController controller;
   Stream stream;
   // Test `StreamController.broadcast` streams. Note that the nested listener
   // doesn't see the error, but the outer one does.
   catchErrors(() {
     catchErrors(() {
       controller = new StreamController.broadcast();
       controller.stream
         .map((x) {
           events.add("map $x");
           return x + 100;
         })
-        .transform(new StreamTransformer(
-            handleError: (e, sink) => sink.add("error $e")))
+        .transform(new StreamTransformer.fromHandlers(
+            handleError: (e, st, sink) { sink.add("error $e"); }))
         .listen((x) { events.add("stream $x"); });
     }).listen((x) { events.add(x); })
       .asFuture().then((_) { Expect.fail("Unexpected callback"); });
     controller.stream.listen((x) { events.add("stream2 $x"); },
                              onError: (x) { events.add("stream2 error $x"); });
     controller.add(1);
     // Errors are not allowed to traverse boundaries, but in this case the
     // first listener of the broadcast stream is in the same error-zone. So
     // this should work.
     controller.addError(2);
@@ skipping 11 matching lines @@
                           "stream 101",
                           "stream2 1",
                           "stream2 error 2",
                           "outer: 2",
                         ],
                         events);
       asyncEnd();
     });
   });
 }