Make first and last getters.

tests/html/element_test.dart

Index: tests/html/element_test.dart
diff --git a/tests/html/element_test.dart b/tests/html/element_test.dart
index 5295a076b5b4859fcc850434602ebaefc395efe6..511eef7d091764d79c81263e4a7d8c478cbd0b78 100644
--- a/tests/html/element_test.dart
+++ b/tests/html/element_test.dart
@@ -497,7 +497,7 @@ main() {
 
     test('last', () {
       var el = makeElementWithChildren();
-      Expect.isTrue(el.elements.last() is InputElement);
+      Expect.isTrue(el.elements.last is InputElement);
     });
 
     test('forEach', () {
@@ -557,13 +557,13 @@ main() {
     test('add', () {
       var el = makeElement();
       el.elements.add(new Element.tag('hr'));
-      Expect.isTrue(el.elements.last() is HRElement);
+      Expect.isTrue(el.elements.last is HRElement);
     });
 
     test('addLast', () {
       var el = makeElement();
       el.elements.addLast(new Element.tag('hr'));
-      Expect.isTrue(el.elements.last() is HRElement);
+      Expect.isTrue(el.elements.last is HRElement);
     });
 
     test('iterator', () {
@@ -636,7 +636,7 @@ main() {
     }
 
     test('last', () {
-      Expect.isTrue(getQueryAll().last() is HRElement);
+      Expect.isTrue(getQueryAll().last is HRElement);
     });
 
     test('forEach', () {