Practically remove boot.js, adds the initialization from the Dart side of

pkg/polymer/test/instance_attrs_test.dart

Index: pkg/polymer/test/instance_attrs_test.dart
diff --git a/pkg/polymer/test/instance_attrs_test.dart b/pkg/polymer/test/instance_attrs_test.dart
index 71030797992954669cf2591aa5375da681031c35..cf29bb533a3e70e2d2fb71234d0102af344bdf19 100644
--- a/pkg/polymer/test/instance_attrs_test.dart
+++ b/pkg/polymer/test/instance_attrs_test.dart
@@ -11,9 +11,13 @@ import 'package:polymer/polymer.dart';
 @CustomTag('my-element')
 class MyElement extends PolymerElement {
   MyElement.created() : super.created();
+
+  // Added so that [attributes] can be read via mirrors in polymer expressions.
+  // TODO(sigmund): remove this?

[Jennifer Messerly, 2013/10/17 02:04:35]

Funny, I almost added this line. I wonder why this was working for me?

in any case -- I don't think you need a TODO; it's a reasonable thing for the
test to do

[Siggi Cherem (dart-lang), 2013/10/17 02:37:40]

:-) - removed TODO. Yeah I'm not sure why it was failing only for me here.

+  get attributes => super.attributes;
 }
 
-main() {
+@initMethod _main() {
   useHtmlConfiguration();
 
   test('attributes were deserialized', () {