Remove service.Class.children, and (mostly) as a side-effect sort the class hierarchy view.

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

 <link rel="import" href="../../../../packages/polymer/polymer.html">
 <link rel="import" href="curly_block.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="instance_ref.html">
 <link rel="import" href="library_ref.html">
 <link rel="import" href="nav_bar.html">
 <link rel="import" href="observatory_element.html">
@@ skipping 33 matching lines @@
         <div class="memberItem">
           <div class="memberName">script</div>
           <div class="memberValue">
             <script-ref ref="{{ cls.script }}" pos="{{ cls.tokenPos }}">
             </script-ref>
           </div>
         </div>
 
         <div class="memberItem">&nbsp;</div>
 
-        <template if="{{ cls.superClass != null }}">
+        <template if="{{ cls.superclass != null }}">
           <div class="memberItem">
             <div class="memberName">extends</div>
             <div class="memberValue">
-              <class-ref ref="{{ cls.superClass }}"></class-ref>
+              <class-ref ref="{{ cls.superclass }}"></class-ref>
             </div>
           </div>
         </template>
-        <template if="{{ cls.subClasses.length > 0 }}">
+        <template if="{{ cls.subclasses.length > 0 }}">
           <div class="memberItem">
             <div class="memberName">extended by</div>
             <div class="memberValue">
-              <template repeat="{{ subclass in cls.subClasses }}">
+              <template repeat="{{ subclass in cls.subclasses }}">
                 <class-ref ref="{{ subclass }}"></class-ref>
               </template>
             </div>
           </div>
         </template>
 
         <div class="memberItem">&nbsp;</div>
 
         <template if="{{ cls.interfaces.length > 0 }}">
           <div class="memberItem">
@@ skipping 116 matching lines @@
                   startPos="{{ cls.tokenPos }}"
                   endPos="{{ cls.endTokenPos }}">
     </script-inset>
 
     <br><br><br><br>
     <br><br><br><br>
   </template>
 </polymer-element>
 
 <script type="application/dart" src="class_view.dart"></script>