Cleanup method signatures that were incorrect due to a lack of understanding about how Dart generic…

tests/html/element_classes_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.
 
 library ElementTest;
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_config.dart';
 import 'dart:collection';
 import 'dart:html';
 
@@ skipping 180 matching lines @@
     classes.add('aardvark');
     expect(classes, orderedEquals(['foo', 'bar', 'baz', 'aardvark']));
     classes.toggle('baz');
     expect(classes, orderedEquals(['foo', 'bar', 'aardvark']));
     classes.toggle('baz');
     expect(classes, orderedEquals(['foo', 'bar', 'aardvark', 'baz']));
   });
 
   Element listElement;
 
-  ElementList listElementSetup() {
+  ElementList<Element> listElementSetup() {
     listElement = makeListElement();
     document.documentElement.children.add(listElement);
     return document.queryAll('li');
   }
 
   test('listClasses=', () {
     var elements =  listElementSetup();
     elements.classes = ['foo', 'qux'];
     elements = document.queryAll('li');
     for (Element e in elements) {
@@ skipping 116 matching lines @@
     document.documentElement.children.remove(listElement);
   });
 
   test('listContainsAll', () {
     var elements = listElementSetup();
     expect(elements.classes.containsAll(['qux', 'meta', 'mornin']), isFalse);
     expect(elements.classes.containsAll(['qux', 'lassy', 'classy']), isTrue);
     document.documentElement.children.remove(listElement);
   });
 }