Using HeapSnapshotClassOutbound for outbound references

runtime/observatory/lib/src/heap_snapshot/heap_snapshot.dart

 // Copyright (c) 2016, 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.
 
 part of heap_snapshot;
 
 class HeapSnapshot implements M.HeapSnapshot {
   ObjectGraph graph;
   DateTime timestamp;
   int get objects => graph.vertexCount;
@@ skipping 178 matching lines @@
 
   Iterable<HeapSnapshotClassOutbound> _outbounds;
   Iterable<HeapSnapshotClassOutbound> get outbounds {
     if (_outbounds != null) {
       return _outbounds;
     } else {
       // It is important to keep the template.
       // https://github.com/dart-lang/sdk/issues/27144
       return _outbounds = new List<HeapSnapshotClassOutbound>.unmodifiable(
         outgoingEdges.values.map((edge) {
-          return new HeapSnapshotClassInbound(this, edge);
+          return new HeapSnapshotClassOutbound(this, edge);
         })
       );
     }
   }
 
   MergedVertex(this.isolate, this.cid);
 }
 
 class HeapSnapshotClassInbound implements M.HeapSnapshotClassInbound {
   final MergedVertex vertex;
@@ skipping 11 matching lines @@
   final MergedVertex vertex;
   final MergedEdge edge;
   S.Class get target => edge.sourceVertex != vertex ? edge.sourceVertex.clazz
                                                     : edge.targetVertex.clazz;
   int get count => edge.count;
   int get shallowSize => edge.shallowSize;
   int get retainedSize => edge.retainedSize;
 
   HeapSnapshotClassOutbound(this.vertex, this.edge);
 }