DevTools: DataGrid: fix "recalculateSiblings" method visibility.

Source/devtools/front_end/ui/DataGrid.js

Index: Source/devtools/front_end/ui/DataGrid.js
diff --git a/Source/devtools/front_end/ui/DataGrid.js b/Source/devtools/front_end/ui/DataGrid.js
index cc73f45c27c1c03ccddd69207aa62104f6fda470..69c44e4ee69677d9e5e1022f77fd66cec12de94f 100644
--- a/Source/devtools/front_end/ui/DataGrid.js
+++ b/Source/devtools/front_end/ui/DataGrid.js
@@ -1378,7 +1378,7 @@ WebInspector.DataGridNode.prototype = {
 
         child.parent = this;
         child.dataGrid = this.dataGrid;
-        child._recalculateSiblings(index);
+        child.recalculateSiblings(index);
 
         child._depth = undefined;
         child._revealed = undefined;
@@ -1449,8 +1449,9 @@ WebInspector.DataGridNode.prototype = {
 
     /**
      * @param {number} myIndex
+     * @protected
      */
-    _recalculateSiblings: function(myIndex)
+    recalculateSiblings: function(myIndex)
     {
         if (!this.parent)
             return;