update to polymer js 0.5.1

pkg/polymer/test/build/common.dart

Index: pkg/polymer/test/build/common.dart
diff --git a/pkg/polymer/test/build/common.dart b/pkg/polymer/test/build/common.dart
index 3eaa805a87c1a604129af19991713c3eecebd6d8..771e8e80a6e1b17e4c3c7141c68fda40c53295d8 100644
--- a/pkg/polymer/test/build/common.dart
+++ b/pkg/polymer/test/build/common.dart
@@ -201,10 +201,12 @@ const EMPTY_DATA = '{"experimental_bootstrap":false,"script_ids":[]}';
 
 const DART_SUPPORT_TAG =
     '<script src="packages/web_components/dart_support.js"></script>\n';
+const WEB_COMPONENTS_JS_TAG =
+    '<script src="packages/web_components/webcomponents.min.js"></script>\n';
+const COMPATIBILITY_JS_TAGS =
+    '$WEB_COMPONENTS_JS_TAG$DART_SUPPORT_TAG';
 const PLATFORM_JS_TAG =
     '<script src="packages/web_components/platform.js"></script>\n';
-const WEB_COMPONENTS_TAG =
-    '$PLATFORM_JS_TAG$DART_SUPPORT_TAG';
 
 const INTEROP_TAG = '<script src="packages/browser/interop.js"></script>\n';
 const DART_JS_TAG = '<script src="packages/browser/dart.js"></script>';