Replace bootstrap logic with 'boot.js', use 'component/dart' mime-type and add

pkg/polymer/test/noscript_test.dart

Index: pkg/polymer/test/noscript_test.dart
diff --git a/pkg/polymer/test/noscript_test.dart b/pkg/polymer/test/noscript_test.dart
index 06cec774c48994524e85c70c42a433d69ecfb411..58a1c0e19cb6846715d47a2124789eb7c3656be9 100644
--- a/pkg/polymer/test/noscript_test.dart
+++ b/pkg/polymer/test/noscript_test.dart
@@ -18,7 +18,8 @@ Future<List<MutationRecord>> onMutation(Node node) {
   return completer.future;
 }
 
-main() => initPolymer().run(() {
+@initMethod
+main() {
   useHtmlConfiguration();
 
   var ready = Polymer.onReady.then((_) {
@@ -35,4 +36,4 @@ main() => initPolymer().run(() {
     expect(querySelector('x-b').shadowRoot.nodes.first.text, 'b');
     expect(querySelector('x-d').shadowRoot.nodes.first.text, 'd');
   });
-});
+}