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

pkg/polymer/test/attr_deserialize_test.html

Index: pkg/polymer/test/attr_deserialize_test.html
diff --git a/pkg/polymer/test/attr_deserialize_test.html b/pkg/polymer/test/attr_deserialize_test.html
index 35ef320b4442937336f2587b9db8ece7521c20bc..8179078e73030e4f6f49b8fb541fac786ef54005 100644
--- a/pkg/polymer/test/attr_deserialize_test.html
+++ b/pkg/polymer/test/attr_deserialize_test.html
@@ -25,6 +25,7 @@ BSD-style license that can be found in the LICENSE file.
         json="{'here': 'is', 'some': 'json', 'x': 123}">
     </my-element>
 
-    <script type="application/dart" src="attr_deserialize_test.dart"></script>
+    <script type="application/dart;component=1"
+            src="attr_deserialize_test.dart"></script>
   </body>
 </html>