Rework how types work in the VM Service.

runtime/bin/vmservice/observatory/lib/src/elements/instance_view.html

 <link rel="import" href="../../../../packages/polymer/polymer.html">
 <link rel="import" href="class_ref.html">
 <link rel="import" href="error_view.html">
 <link rel="import" href="eval_box.html">
 <link rel="import" href="eval_link.html">
 <link rel="import" href="field_ref.html">
 <link rel="import" href="function_ref.html">
 <link rel="import" href="inbound_reference.html">
 <link rel="import" href="instance_ref.html">
 <link rel="import" href="observatory_element.html">
@@ skipping 13 matching lines @@
       <nav-refresh callback="{{ refresh }}"></nav-refresh>
       <nav-control></nav-control>
     </nav-bar>
 
     <template if="{{ instance.isError }}">
       <error-view error_obj="{{ instance['error'] }}"></error-view>
     </template>
 
     <template if="{{ !instance.isError }}">
       <div class="content">
-        <template if="{{ instance.isType }}">
+        <template if="{{ instance.isAbstractType }}">
           <h1>type {{ instance.name }}</h1>
         </template>
-        <template if="{{ !instance.isType }}">
+        <template if="{{ !instance.isAbstractType }}">
           <h1>instance of {{ instance.clazz.name }}</h1>
         </template>
 
         <object-common object="{{ instance }}"></object-common>
 
         <div class="memberList">
           <div class="memberItem">&nbsp;</div>
 
           <template if="{{ instance.valueAsString != null }}">
             <div class="memberItem">
@@ skipping 126 matching lines @@
       </div>
 
       <br><br><br><br>
       <br><br><br><br>
 
     </template>
   </template>
 </polymer-element>
 
 <script type="application/dart" src="instance_view.dart"></script>