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

pkg/polymer/test/entered_view_test.html

Index: pkg/polymer/test/entered_view_test.html
diff --git a/pkg/polymer/test/entered_view_test.html b/pkg/polymer/test/entered_view_test.html
index d9e937ddfdcf3b2c4d4a3b3eafe76f8e420c7f7f..078556a356da0f0761045d9bed54cddffc73bc61 100644
--- a/pkg/polymer/test/entered_view_test.html
+++ b/pkg/polymer/test/entered_view_test.html
@@ -32,6 +32,7 @@ BSD-style license that can be found in the LICENSE file.
     outer element:
     <x-outer></x-outer>
 
-    <script type="application/dart" src="entered_view_test.dart"></script>
+    <script type="application/dart;component=1"
+            src="entered_view_test.dart"></script>
   </body>
 </html>