Fixing a number of dart:html analyzer issues

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:async';
 import 'dart:html';
 import 'dart:svg' as svg;
@@ skipping 421 matching lines @@
       expect(el.children[1], isHRElement);
       expect(el.children[2], isInputElement);
     });
 
     test('add', () {
       var el = makeElement();
       el.children.add(new Element.tag('hr'));
       expect(el.children.last, isHRElement);
     });
 
-    test('addLast', () {
-      var el = makeElement();
-      el.children.addLast(new Element.tag('hr'));
-      expect(el.children.last, isHRElement);
-    });
-
     test('iterator', () {
       var els = [];
       var el = makeElementWithChildren();
       for (var subel in el.children) {
         els.add(subel);
       }
       expect(els[0], isBRElement);
       expect(els[1], isImageElement);
       expect(els[2], isInputElement);
     });
@@ skipping 129 matching lines @@
       expect(els[1], isSpanElement);
       expect(els[2], isHRElement);
     });
 
     test('getRange', () {
       expect(getQueryAll().getRange(1, 1) is List<Element>, isTrue);
     });
 
     testUnsupported('[]=', () => getQueryAll()[1] = new Element.tag('br'));
     testUnsupported('add', () => getQueryAll().add(new Element.tag('br')));
-    testUnsupported('addLast', () =>
-        getQueryAll().addLast(new Element.tag('br')));
 
     testUnsupported('addAll', () {
       getQueryAll().addAll([
         new Element.tag('span'),
         new Element.tag('a'),
         new Element.tag('h1')
       ]);
     });
 
     testUnsupported('sort', () => getQueryAll().sort((a1, a2) => true));
@@ skipping 32 matching lines @@
     });
 
     test('getRange', () {
       var range = makeElList().getRange(1, 2);
       expect(range, isElementList);
       expect(range[0], isImageElement);
       expect(range[1], isInputElement);
     });
   });
 }