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

tests/html/element_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_individual_config.dart';
 import 'dart:async';
 import 'dart:html';
 import 'dart:svg' as svg;
@@ skipping 897 matching lines @@
   group('ElementList', () {
     // Tests for methods on the DOM class 'NodeList'.
     //
     // There are two interesting things that are checked here from the viewpoint
     // of the dart2js implementation of a 'native' class:
     //
     //   1. Some methods are implementated from by 'Object' or 'Interceptor';
     //      some of these tests simply check that a method can be called.
     //   2. Some methods are implemented by mixins.
 
-    ElementList makeElementList() =>
+    ElementList<Element> makeElementList() =>
         (new Element.html("<div>Foo<br/><!--baz--><br/><br/></div>"))
         .queryAll('br');
 
     test('hashCode', () {
       var nodes = makeElementList();
       var hash = nodes.hashCode;
       final int N = 1000;
       int matchCount = 0;
       for (int i = 0; i < N; i++) {
         if (makeElementList().hashCode == hash) matchCount++;
@@ skipping 40 matching lines @@
 
     test('sublist', () {
       var range = makeElementList().sublist(1, 3);
       expect(range.length, 2);
       expect(range[0], isBRElement);
       expect(range[1], isBRElement);
     });
 
   });
 }