Do not override data getter in heap snapshot grid nodes

Source/devtools/front_end/HeapSnapshotView.js

 /*
  * Copyright (C) 2011 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 760 matching lines @@
         this._constructorsDataGrid.setAllocationNodeId(selectedNode.allocationNodeId());
     },
 
     _inspectedObjectChanged: function(event)
     {
         var selectedNode = event.target.selectedNode;
         if (!this._profile.fromFile() && selectedNode instanceof WebInspector.HeapSnapshotGenericObjectNode)
             ConsoleAgent.addInspectedHeapObject(selectedNode.snapshotNodeId);
     },
 
+    /**
+     * @param {?WebInspector.HeapSnapshotGridNode} nodeItem
+     */
     _setRetainmentDataGridSource: function(nodeItem)
     {
-        if (nodeItem && nodeItem.snapshotNodeIndex)
-            this._retainmentDataGrid.setDataSource(nodeItem.isDeletedNode ? nodeItem.dataGrid.baseSnapshot : nodeItem.dataGrid.snapshot, nodeItem.snapshotNodeIndex);
+        var dataSource = nodeItem && nodeItem.retainersDataSource();
+        if (dataSource)
+            this._retainmentDataGrid.setDataSource(dataSource.snapshot, dataSource.snapshotNodeIndex);
         else
             this._retainmentDataGrid.reset();
     },
 
     /**
      * @param {string} perspectiveTitle
      * @param {function()} callback
      */
     _changePerspectiveAndWait: function(perspectiveTitle, callback)
     {
@@ skipping 1365 matching lines @@
         if (color)
             swatchDiv.style.backgroundColor = color;
         else
             swatchDiv.classList.add("heap-snapshot-stats-empty-swatch");
         nameDiv.textContent = name;
         sizeDiv.textContent = WebInspector.UIString("%s KB", Number.withThousandsSeparator(Math.round(value / 1024)));
     },
 
     __proto__: WebInspector.VBox.prototype
 }