Fix type error, add tests for it, get package ready for a patch release.

pkg/polymer/test/build/static_clean_test.dart

Index: pkg/polymer/test/build/static_clean_test.dart
diff --git a/samples/tracker/build.dart b/pkg/polymer/test/build/static_clean_test.dart
similarity index 67%
copy from samples/tracker/build.dart
copy to pkg/polymer/test/build/static_clean_test.dart
index c66e93b23b0d7e9e3bbaa021f50bc45b8ce697ff..410fc51aa9c7ca1051e94c38125c478169d77267 100644
--- a/samples/tracker/build.dart
+++ b/pkg/polymer/test/build/static_clean_test.dart
@@ -2,8 +2,10 @@
 // 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 polymer.test.build.static_clean_test;
+
 import 'package:polymer/builder.dart';
 
-void main(args) {
-  build(entryPoints: ['web/index.html'], options: parseOptions(args));
+void main() {
+  // Check that builder.dart is statically clean. Nothing to do.
 }