Wrapping leaf nodes in non polymer elements

runtime/observatory/lib/src/elements/service_ref.html

 <link rel="import" href="../../../../packages/polymer/polymer.html">
 <link rel="import" href="observatory_element.html">
 
 <polymer-element name="service-ref" extends="observatory-element">
 </polymer-element>
 
-<polymer-element name="any-service-ref" extends="observatory-element">
-</polymer-element>
-
 <polymer-element name="object-ref" extends="service-ref">
   <template><link rel="stylesheet" href="css/shared.css">
 
     <template if="{{ ref.isObjectPool }}">
       <a on-click="{{ goto }}" _href="{{ url }}">
         <em>{{ ref.vmType }}</em> ({{ ref.length }})
       </a>
       <curly-block callback="{{ expander() }}" expandKey="{{ expandKey }}">
         <template if="{{ expanded }}">
         <div class="indented">
@@ skipping 33 matching lines @@
         <a on-click="{{ goto }}" _href="{{ url }}"><em>{{ ref.vmType }}</em></a>
       </template>
       <template if="{{ !nameIsEmpty }}">
         <a on-click="{{ goto }}" _href="{{ url }}"><em>{{ name }}</em></a>
       </template>
     </template>
   </template>
 </polymer-element>
 
 <script type="application/dart" src="service_ref.dart"></script>