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

third_party/WebKit/Source/devtools/front_end/data_grid/ViewportDataGrid.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 /**
  * @unrestricted
  * @extends {DataGrid.DataGrid<!NODE_TYPE>}
  * @template NODE_TYPE
  */
 DataGrid.ViewportDataGrid = class extends DataGrid.DataGrid {
   /**
@@ skipping 304 matching lines @@
    */
   isStriped() {
     return this._isStriped;
   }
 
   /**
    * @protected
    */
   clearFlatNodes() {
     this._flatNodes = null;
-    var parent = /** @type {!DataGrid.ViewportDataGridNode} */ (this.parent);
+    var parent = this.parent();
     if (parent)
       parent.clearFlatNodes();
   }
 
   /**
    * @return {!Array<!DataGrid.ViewportDataGridNode>}
    */
   flatChildren() {
     if (this._flatNodes)
       return this._flatNodes;
@@ skipping 22 matching lines @@
     return flatNodes;
   }
 
   /**
    * @override
    * @param {!NODE_TYPE} child
    * @param {number} index
    */
   insertChild(child, index) {
     this.clearFlatNodes();
-    if (child.parent === this) {
+    if (child.parent() === this) {
       var currentIndex = this.children.indexOf(child);
       if (currentIndex < 0)
         console.assert(false, 'Inconsistent DataGrid state');
       if (currentIndex === index)
         return;
       if (currentIndex < index)
         --index;
     }
     child.remove();
-    child.parent = this;
+    child.setParent(this);
     child.dataGrid = this.dataGrid;
     if (!this.children.length)
       this.setHasChildren(true);
     this.children.splice(index, 0, child);
     child.recalculateSiblings(index);
     if (this._expanded)
       this.dataGrid.scheduleUpdateStructure();
   }
 
   /**
    * @override
    * @param {!NODE_TYPE} child
    */
   removeChild(child) {
     this.clearFlatNodes();
     if (this.dataGrid)
       this.dataGrid.updateSelectionBeforeRemoval(child, false);
     if (child.previousSibling)
       child.previousSibling.nextSibling = child.nextSibling;
     if (child.nextSibling)
       child.nextSibling.previousSibling = child.previousSibling;
-    if (child.parent !== this)
+    if (child.parent() !== this)
       throw 'removeChild: Node is not a child of this node.';
 
     child._unlink();
     this.children.remove(child, true);
     if (!this.children.length)
       this.setHasChildren(false);
     if (this._expanded)
       this.dataGrid.scheduleUpdateStructure();
   }
 
@@ skipping 11 matching lines @@
     if (this._expanded)
       this.dataGrid.scheduleUpdateStructure();
   }
 
   _unlink() {
     if (this.attached()) {
       this.existingElement().remove();
       this.wasDetached();
     }
     this.dataGrid = null;
-    this.parent = null;
+    this.setParent(null);
     this.nextSibling = null;
     this.previousSibling = null;
   }
 
   /**
    * @override
    */
   collapse() {
     if (!this._expanded)
       return;
@@ skipping 61 matching lines @@
 
   /**
    * @override
    * @param {number} index
    */
   recalculateSiblings(index) {
     this.clearFlatNodes();
     super.recalculateSiblings(index);
   }
 };