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

third_party/WebKit/Source/devtools/front_end/profiler/BottomUpProfileDataGrid.js

 /*
  * Copyright (C) 2009 280 North 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 231 matching lines @@
    */
   focus(profileDataGridNode) {
     if (!profileDataGridNode)
       return;
 
     this.save();
 
     var currentNode = profileDataGridNode;
     var focusNode = profileDataGridNode;
 
-    while (currentNode.parent && (currentNode instanceof Profiler.ProfileDataGridNode)) {
+    while (currentNode.parent() && (currentNode instanceof Profiler.ProfileDataGridNode)) {
       currentNode._takePropertiesFromProfileDataGridNode(profileDataGridNode);
 
       focusNode = currentNode;
-      currentNode = currentNode.parent;
+      currentNode = currentNode.parent();
 
       if (currentNode instanceof Profiler.ProfileDataGridNode)
         currentNode._keepOnlyChild(focusNode);
     }
 
     this.children = [focusNode];
     this.total = profileDataGridNode.total;
   }
 
   /**
@@ skipping 23 matching lines @@
       this.sort(this.lastComparator, true);
   }
 
   /**
    * @override
    */
   populateChildren() {
     Profiler.BottomUpProfileDataGridNode._sharedPopulate(this);
   }
 };