Make first and last getters.

tests/html/documentfragment_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('DocumentFragmentTest');
 #import('../../pkg/unittest/unittest.dart');
 #import('../../pkg/unittest/html_config.dart');
 #import('dart:html');
 #source('util.dart');
 
@@ skipping 148 matching lines @@
     test('accessors are wrapped', () {
       init();
       Expect.equals("A", elements[0].tagName);
       Expect.listEquals(
           ["I"], _nodeStrings(elements.filter((e) => e.tagName == "I")));
       Expect.isTrue(elements.every((e) => e is Element));
       Expect.isTrue(elements.some((e) => e.tagName == "U"));
       Expect.isFalse(elements.isEmpty);
       Expect.equals(4, elements.length);
       Expect.equals("I", elements[2].tagName);
-      Expect.equals("U", elements.last().tagName);
+      Expect.equals("U", elements.last.tagName);
     });
 
     test('setting elements overwrites nodes as well', () {
       init();
       fragment.elements = [new Element.tag("DIV"), new Element.tag("HEAD")];
       Expect.listEquals(["DIV", "HEAD"], _nodeStrings(fragment.nodes));
     });
   });
 
   test('setting innerHTML works', () {
@@ skipping 165 matching lines @@
   //   // assertConstError(() => fragment.classes.add('foo'));
   // });
 
   test('query searches the fragment', () {
     var fragment = new DocumentFragment.html(
       "<div class='foo'><a>foo</a><b>bar</b></div>");
     Expect.equals("A", fragment.query(".foo a").tagName);
     Expect.listEquals(["A", "B"], _nodeStrings(fragment.queryAll(".foo *")));
   });
 }