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

third_party/WebKit/LayoutTests/inspector/components/datagrid-test.js

 function initialize_DataGridTest()
 {
 
 InspectorTest.preloadModule("data_grid");
 
 InspectorTest.dumpDataGrid = function(root, descentIntoCollapsed, prefix)
 {
     if (!prefix)
         prefix = "";
     var suffix = root.selected ? " <- selected" : "";
@@ skipping 10 matching lines @@
         return;
     for (var child of root.children)
         InspectorTest.dumpDataGrid(child, descentIntoCollapsed, prefix + " ");
 }
 
 InspectorTest.validateDataGrid = function(root)
 {
     var children = root.children;
     for (var i = 0; i < children.length; ++i) {
         var child = children[i];
-        if (child.parent !== root)
+        if (child.parent() !== root)
             throw "Wrong parent for child " + child.data.id + " of " + root.data.id;
         if (child.nextSibling !== (i + 1 === children.length ? null : children[i + 1]))
             throw "Wrong child.nextSibling for " + child.data.id + " (" + i + " of " + children.length + ") ";
         if (child.previousSibling !== (i ? children[i - 1] : null))
             throw "Wrong child.previousSibling for " + child.data.id + " (" + i + " of " + children.length + ") ";
-        if (child.parent && !child.parent._isRoot && child.depth !== root.depth + 1)
+        if (child.parent() && !child.parent()._isRoot && child.depth !== root.depth + 1)
             throw "Wrong depth for " + child.data.id + " expected " + (root.depth + 1) + " but got " + child.depth;
         InspectorTest.validateDataGrid(child);
     }
     var selectedNode = root.dataGrid.selectedNode;
-    if (!root.parent && selectedNode) {
+    if (!root.parent() && selectedNode) {
         if (!selectedNode.selectable)
             throw "Selected node is not selectable";
-        for (var node = selectedNode; node && node !== root; node = node.parent) { }
+        for (var node = selectedNode; node && node !== root; node = node.parent()) { }
         if (!node)
             throw "Selected node (" + selectedNode.data.id + ") is not within the DataGrid";
     }
 }
 
 InspectorTest.dumpAndValidateDataGrid = function(root)
 {
     InspectorTest.dumpDataGrid(root);
     InspectorTest.validateDataGrid(root);
 }
 
 }