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

pkg/polymer/test/take_attributes_test.html

Index: pkg/polymer/test/take_attributes_test.html
diff --git a/pkg/polymer/test/take_attributes_test.html b/pkg/polymer/test/take_attributes_test.html
index a7fa8e7b0b9a59fe04ed6e89ac2e16d6d5b3070d..163f4992ee6b868558ee51c8386dc29116266237 100644
--- a/pkg/polymer/test/take_attributes_test.html
+++ b/pkg/polymer/test/take_attributes_test.html
@@ -71,6 +71,7 @@ BSD-style license that can be found in the LICENSE file.
            values="{ 'movie': 'Buckaroo Banzai', 'DOB': '07/31/1978' }">
     </x-obj>
 
-  <script type="application/dart" src="take_attributes_test.dart"></script>
+  <script type="application/dart;component=1"
+          src="take_attributes_test.dart"></script>
   </body>
 </html>