Redo StreamTransformers so they work with Stack traces.

tests/lib/async/catch_errors26_test.dart

Index: tests/lib/async/catch_errors26_test.dart
diff --git a/tests/lib/async/catch_errors26_test.dart b/tests/lib/async/catch_errors26_test.dart
index e2894f80eeaef0509fd71007451799445dba7ae0..6d2a6fb593f1606050034d6ef1d305d5abc258c6 100644
--- a/tests/lib/async/catch_errors26_test.dart
+++ b/tests/lib/async/catch_errors26_test.dart
@@ -24,8 +24,8 @@ main() {
           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"); });