Make first and last getters.

tests/html/selectelement_test.dart

 // Copyright (c) 2012, 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('selectelement_test');
 #import('../../pkg/unittest/unittest.dart');
 #import('../../pkg/unittest/html_config.dart');
 #import('dart:html');
 
 main() {
@@ skipping 35 matching lines @@
   test('options', () {
     var element = new SelectElement();
     var options = [
       new OptionElement(),
       new OptionElement('data', 'two', false, true),
       new OptionElement('data', 'two', false, true),
       new OptionElement(),
     ];
     element.elements.addAll(options);
     // Use last to make sure that the list was correctly wrapped.
-    expect(element.options.last(), options[3]);
+    expect(element.options.last, options[3]);
   });
 }