Revert "Build Observatory with runtime"

runtime/bin/vmservice/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="{{ nameIsEmpty }}">
       <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>
 </polymer-element>
 
 <script type="application/dart" src="service_ref.dart"></script>