[Devtools] Moved DataGridNode's .parent property to proper getter/setter

third_party/WebKit/Source/devtools/front_end/profiler/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 335 matching lines @@
 
     this._topPaddingHeight = 0;
     this._bottomPaddingHeight = 0;
 
     this._addVisibleNodes(this.rootNode(), scrollTop, scrollTop + viewPortHeight);
 
     this.setVerticalPadding(this._topPaddingHeight, this._bottomPaddingHeight);
 
     if (selectedNode) {
       // Keep selection even if the node is not in the current viewport.
-      if (selectedNode.parent)
+      if (selectedNode.parent())
         selectedNode.select(true);
       else
         this.selectedNode = selectedNode;
     }
   }
 
   /**
    * @param {!DataGrid.DataGridNode} parentNode
    * @param {number} topBound
    * @param {number} bottomBound
@@ skipping 644 matching lines @@
     function compare(a, b) {
       if (a[fieldName] > b[fieldName])
         return compareResult;
       if (a[fieldName] < b[fieldName])
         return -compareResult;
       return 0;
     }
     return compare;
   }
 };