Cleanup for pkg/observe and pkg/polymer

pkg/polymer/example/component/news/test/news_index_test.dart

Index: pkg/polymer/example/component/news/test/news_index_test.dart
diff --git a/pkg/polymer/example/component/news/test/news_index_test.dart b/pkg/polymer/example/component/news/test/news_index_test.dart
index 4825b832e69952d135f27fd5f4fbbb27f9117ef0..6e0c660e7905899a65bcae1dfc5aeea56a6c4591 100644
--- a/pkg/polymer/example/component/news/test/news_index_test.dart
+++ b/pkg/polymer/example/component/news/test/news_index_test.dart
@@ -16,13 +16,13 @@ main() {
       .map((n) => n.query('a').href.split('/').last).toList();
 
   test('initial state', () {
-    final listComp = query('ul');
-    final items = listComp.queryAll('li');
+    final listComp = querySelector('ul');
+    final items = listComp.querySelectorAll('li');
     expect(items.length, 6);
     expect(extractLinks(items), ['1', '2', '3', '4', '4', '5']);
     expect(listComp is Polymer, true, reason: 'x-news should be created');
 
-    final contents = listComp.shadowRoot.queryAll('content');
+    final contents = listComp.shadowRoot.querySelectorAll('content');
     expect(contents.length, 2, reason: 'news has 2 content tags');
     expect(extractLinks(contents[0].getDistributedNodes()),
         ['3', '5'], reason: 'breaking stories first');