Fixing a bunch of dartc errors in dart:html tests.

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 '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:html';
 import 'dart:svg' as svg;
 
@@ skipping 462 matching lines @@
         expect(attributes.length, 4);
         attributes['style'] = 'width: 300px;';
         expect(attributes.length, 5);
       });
 
       test('namespaces', () {
         var element = new svg.SvgElement.svg(
           '''<svg xmlns="http://www.w3.org/2000/svg"
                   xmlns:xlink="http://www.w3.org/1999/xlink">
             <image xlink:href="foo" data-foo="bar"/>
-          </svg>''').elements[0];
+          </svg>''').children[0];
 
         var attributes = element.attributes;
         expect(attributes.length, 1);
         expect(attributes['data-foo'], 'bar');
 
         var xlinkAttrs =
             element.getNamespacedAttributes('http://www.w3.org/1999/xlink');
         expect(xlinkAttrs.length, 1);
         expect(xlinkAttrs['href'], 'foo');
 
@@ skipping 279 matching lines @@
     });
 
     test('getRange', () {
       var range = makeElList().getRange(1, 2);
       expect(range, isElementList);
       expect(range[0], isImageElement);
       expect(range[1], isInputElement);
     });
   });
 }