Added new version of reduce.

tests/html/streams_test.dart

 library streams_test;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:async';
 import 'dart:html';
 
 class StreamHelper {
   var _a;
   StreamHelper() {
     _a = new TextInputElement();
@@ skipping 173 matching lines @@
 
   test('where', () {
     stream.where((_) => true).listen((_) {});
   });
 
   test('map', () {
     stream.map((_) => null).listen((_) {});
   });
 
   test('reduce', () {
-    stream.reduce(null, (a, b) => null).then((_) {});
+    stream.reduce((a, b) => null).then((_) {});
   });
 
   test('fold', () {
     stream.fold(null, (a, b) => null).then((_) {});
   });
 
   test('contains', () {
     stream.contains((_) => true).then((_) {});
   });
 
   test('every', () {
     stream.every((_) => true).then((_) {});
   });
 
   test('any', () {
     stream.any((_) => true).then((_) {});
   });
 
   test('length', () {
     stream.length.then((_) {});
   });
 
-  test('min', () {
-    stream.min((a, b) => 0).then((_) {});
-  });
-
-  test('max', () {
-    stream.max((a, b) => 0).then((_) {});
-  });
-
   test('isEmpty', () {
     stream.isEmpty.then((_) {});
   });
 
   test('toList', () {
     stream.toList().then((_) {});
   });
 
   test('toSet', () {
     stream.toSet().then((_) {});
@@ skipping 40 matching lines @@
   });
 
   test('singleWhere', () {
     stream.singleWhere((_) => true).then((_) {});
   });
 
   test('elementAt', () {
     stream.elementAt(0).then((_) {});
   });
 }