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

third_party/WebKit/LayoutTests/inspector/profiler/heap-snapshot-test.js

 var initialize_HeapSnapshotTest = function() {
 
 InspectorTest.preloadPanel("heap_profiler");
 
 InspectorTest.createHeapSnapshotMockFactories = function() {
 
 InspectorTest.createJSHeapSnapshotMockObject = function()
 {
     return {
         _rootNodeIndex: 0,
@@ skipping 542 matching lines @@
     {
         rootNode.removeEventListener(Profiler.HeapSnapshotGridNode.Events.PopulateComplete, populateComplete, this);
         callback(rootNode);
     }
     rootNode.addEventListener(Profiler.HeapSnapshotGridNode.Events.PopulateComplete, populateComplete, this);
 };
 
 InspectorTest.clickShowMoreButton = function(buttonName, row, callback)
 {
     callback = InspectorTest.safeWrap(callback);
-    var parent = row.parent;
+    var parent = row.parent();
     function populateComplete()
     {
         parent.removeEventListener(Profiler.HeapSnapshotGridNode.Events.PopulateComplete, populateComplete, this);
         function callCallback()
         {
             callback(parent);
         }
         setTimeout(callCallback, 0);
     }
     parent.addEventListener(Profiler.HeapSnapshotGridNode.Events.PopulateComplete, populateComplete, this);
@@ skipping 153 matching lines @@
         function sortingComplete()
         {
             dataGrid.removeEventListener(Profiler.HeapSnapshotSortableDataGrid.Events.SortingComplete, sortingComplete, null);
             callback();
         }
         dataGrid.addEventListener(Profiler.HeapSnapshotSortableDataGrid.Events.SortingComplete, sortingComplete, null);
     }
 };
 
 };