Do not override data getter in heap snapshot grid nodes

Source/devtools/front_end/HeapSnapshotDataGrids.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 600 matching lines @@
     ];
     WebInspector.HeapSnapshotSortableDataGrid.call(this, columns);
 }
 
 WebInspector.HeapSnapshotContainmentDataGrid.prototype = {
     setDataSource: function(snapshot, nodeIndex)
     {
         this.snapshot = snapshot;
         var node = { nodeIndex: nodeIndex || snapshot.rootNodeIndex };
         var fakeEdge = { node: node };
-        this.setRootNode(new WebInspector.HeapSnapshotObjectNode(this, false, fakeEdge, null));
+        this.setRootNode(new WebInspector.HeapSnapshotObjectNode(this, snapshot, fakeEdge, null));
         this.rootNode().sort();
     },
 
     sortingChanged: function()
     {
         var rootNode = this.rootNode();
         if (rootNode.hasChildren)
             rootNode.sort();
     },
 
@@ skipping 489 matching lines @@
                 return compareResult;
             if (a[fieldName] < b[fieldName])
                 return -compareResult;
             return 0;
         }
         return compare;
      },
 
     __proto__: WebInspector.DataGrid.prototype
 }