[polymer] fix editor hints -- query/queryAll and unused imports

pkg/polymer/test/publish_inherited_properties_test.dart

Index: pkg/polymer/test/publish_inherited_properties_test.dart
diff --git a/pkg/polymer/test/publish_inherited_properties_test.dart b/pkg/polymer/test/publish_inherited_properties_test.dart
index 24595c411304903d450f957176565e62fb0c69a5..dddbf292c7a3af13704073e744752a9909d2b259 100644
--- a/pkg/polymer/test/publish_inherited_properties_test.dart
+++ b/pkg/polymer/test/publish_inherited_properties_test.dart
@@ -53,7 +53,7 @@ main() {
   setUp(() => Polymer.onReady);
 
   test('published properties', () {
-    published(tag) => (query('polymer-element[name=$tag]')
+    published(tag) => (querySelector('polymer-element[name=$tag]')
         as PolymerDeclaration).publishedProperties;
 
     expect(published('x-zot'), ['Foo', 'Bar', 'zot', 'm']);