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

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

 var initialize_HeapSnapshotTest = function() {
 
 InspectorTest.preloadPanel("profiles");
 
 InspectorTest.createHeapSnapshotMockFactories = function() {
 
 InspectorTest.createJSHeapSnapshotMockObject = function()
 {
     return {
         _rootNodeIndex: 0,
@@ skipping 601 matching lines @@
         row.removeEventListener(Profiler.HeapSnapshotGridNode.Events.PopulateComplete, populateComplete, this);
         function callCallback()
         {
             callback(row);
         }
         setTimeout(callCallback, 0);
     }
     row.addEventListener(Profiler.HeapSnapshotGridNode.Events.PopulateComplete, populateComplete, this);
     (function expand()
     {
-        if (row.hasChildren)
+        if (row.hasChildren())
             row.expand();
         else
             setTimeout(expand, 0);
     })();
 };
 
 InspectorTest.findAndExpandGCRoots = function(callback)
 {
     InspectorTest.findAndExpandRow("(GC roots)", callback);
 };
@@ skipping 94 matching lines @@
         function sortingComplete()
         {
             dataGrid.removeEventListener(Profiler.HeapSnapshotSortableDataGrid.Events.SortingComplete, sortingComplete, null);
             callback();
         }
         dataGrid.addEventListener(Profiler.HeapSnapshotSortableDataGrid.Events.SortingComplete, sortingComplete, null);
     }
 };
 
 };