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

runtime/vm/object.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 4157 matching lines @@
         functions_array.AddValue(function);
       }
     }
   }
   {
     JSONArray subclasses_array(&jsobj, "subclasses");
     const GrowableObjectArray& subclasses =
         GrowableObjectArray::Handle(direct_subclasses());
     if (!subclasses.IsNull()) {
       Class& subclass = Class::Handle();
-      if (!subclasses.IsNull()) {
-        for (intptr_t i = 0; i < subclasses.Length(); ++i) {
-          // TODO(turnidge): Use the Type directly once regis has added
-          // types to the vmservice.
-          subclass ^= subclasses.At(i);
-          subclasses_array.AddValue(subclass);
-        }
+      for (intptr_t i = 0; i < subclasses.Length(); ++i) {
+        // TODO(turnidge): Use the Type directly once regis has added
+        // types to the vmservice.
+        subclass ^= subclasses.At(i);
+        subclasses_array.AddValue(subclass);
       }
     }
   }
   {
     ClassTable* class_table = Isolate::Current()->class_table();
     const ClassHeapStats* stats = class_table->StatsWithUpdatedSize(id());
     if (stats != NULL) {
       JSONObject allocation_stats(&jsobj, "allocationStats");
       stats->PrintToJSONObject(*this, &allocation_stats);
     }
@@ skipping 15380 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart