[DevTools] Simplify getting back to default network order.

Source/devtools/front_end/ui_lazy/DataGrid.js

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *        notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *        notice, this list of conditions and the following disclaimer in the
@@ skipping 865 matching lines @@
      * @param {!WebInspector.DataGrid.Order} sortOrder
      */
     markColumnAsSortedBy: function(columnIdentifier, sortOrder)
     {
         if (this._sortColumnCell)
             this._sortColumnCell.classList.remove(WebInspector.DataGrid.Order.Ascending, WebInspector.DataGrid.Order.Descending);
         this._sortColumnCell = this._headerTableHeaders[columnIdentifier];
         this._sortColumnCell.classList.add(sortOrder);
     },
 
-    /**
-     * @param {string} columnIdentifier
-     * @return {!Element}
-     */
-    headerTableHeader: function(columnIdentifier)
-    {
-        return this._headerTableHeaders[columnIdentifier];
-    },
-
     _mouseDownInDataTable: function(event)
     {
         var gridNode = this.dataGridNodeFromNode(event.target);
         if (!gridNode || !gridNode.selectable)
             return;
 
         if (gridNode.isEventWithinDisclosureTriangle(event))
             return;
 
         if (event.metaKey) {
@@ skipping 865 matching lines @@
 }
 
 WebInspector.CreationDataGridNode.prototype = {
     makeNormal: function()
     {
         this.isCreationNode = false;
     },
 
     __proto__: WebInspector.DataGridNode.prototype
 }