[Devtools] Removed DataGrid's hasChildren getter/setter to use functions

third_party/WebKit/Source/devtools/front_end/profiler/HeapSnapshotGridNodes.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 613 matching lines @@
       callback(target.runtimeModel.createRemoteObjectFromPrimitiveValue(this._name));
     else
       target.heapProfilerAgent().getObjectByHeapObjectId(String(this.snapshotNodeId), objectGroupName, formatResult);
   }
 
   updateHasChildren() {
     /**
      * @this {Profiler.HeapSnapshotGenericObjectNode}
      */
     function isEmptyCallback(isEmpty) {
-      this.hasChildren = !isEmpty;
+      this.setHasChildren(!isEmpty);
     }
     this._provider().isEmpty(isEmptyCallback.bind(this));
   }
 
   /**
    * @param {string} fullName
    * @param {boolean} hasObjectId
    * @return {string}
    */
   shortenWindowURL(fullName, hasObjectId) {
@@ skipping 795 matching lines @@
     return cell;
   }
 
   /**
    * @return {number}
    */
   allocationNodeId() {
     return this._allocationNode.id;
   }
 };