Make first and last getters.

samples/third_party/dromaeo/tests/dom-query-html.dart

Index: samples/third_party/dromaeo/tests/dom-query-html.dart
diff --git a/samples/third_party/dromaeo/tests/dom-query-html.dart b/samples/third_party/dromaeo/tests/dom-query-html.dart
index 85d1654e62f29c5c1c81fe803dbf58e5c74a7763..15a20ac1ab98d3c9ade75c12b5f38dcc04f551e8 100644
--- a/samples/third_party/dromaeo/tests/dom-query-html.dart
+++ b/samples/third_party/dromaeo/tests/dom-query-html.dart
@@ -52,25 +52,25 @@ void main() {
     .test('getElementsByTagName(div)', () {
       for (int i = 0; i < num; i++) {
         List<Element> elems = document.$dom_getElementsByTagName('div');
-        ret = elems.last().$dom_nodeType;
+        ret = elems.last.$dom_nodeType;
       }
     })
     .test('getElementsByTagName(p)', () {
       for (int i = 0; i < num; i++) {
         List<Element> elems = document.$dom_getElementsByTagName('p');
-        ret = elems.last().$dom_nodeType;
+        ret = elems.last.$dom_nodeType;
       }
     })
     .test('getElementsByTagName(a)', () {
       for (int i = 0; i < num; i++) {
         List<Element> elems = document.$dom_getElementsByTagName('a');
-        ret = elems.last().$dom_nodeType;
+        ret = elems.last.$dom_nodeType;
       }
     })
     .test('getElementsByTagName(*)', () {
       for (int i = 0; i < num; i++) {
         List<Element> elems = document.$dom_getElementsByTagName('*');
-        ret = elems.last().$dom_nodeType;
+        ret = elems.last.$dom_nodeType;
       }
     })
     .test('getElementsByTagName (not in document)', () {