DevTools: Get rid of Element.prototype.enableStyleClass

Source/devtools/front_end/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 671 matching lines @@
     /**
      * @param {string} columnIdentifier
      * @param {boolean} visible
      */
     setColumnVisible: function(columnIdentifier, visible)
     {
         if (visible === !this.columns[columnIdentifier].hidden)
             return;
 
         this.columns[columnIdentifier].hidden = !visible;
-        this.element.enableStyleClass("hide-" + columnIdentifier + "-column", !visible);
+        this.element.classList.toggle("hide-" + columnIdentifier + "-column", !visible);
     },
 
     get scrollContainer()
     {
         return this._scrollContainer;
     },
 
     /**
      * @return {boolean}
      */
@@ skipping 540 matching lines @@
     set hasChildren(x)
     {
         if (this._hasChildren === x)
             return;
 
         this._hasChildren = x;
 
         if (!this._element)
             return;
 
-        this._element.enableStyleClass("parent", this._hasChildren);
-        this._element.enableStyleClass("expanded", this._hasChildren && this.expanded);
+        this._element.classList.toggle("parent", this._hasChildren);
+        this._element.classList.toggle("expanded", this._hasChildren && this.expanded);
     },
 
     get hasChildren()
     {
         return this._hasChildren;
     },
 
     set revealed(x)
     {
         if (this._revealed === x)
             return;
 
         this._revealed = x;
 
         if (this._element)
-            this._element.enableStyleClass("revealed", this._revealed);
+            this._element.classList.toggle("revealed", this._revealed);
 
         for (var i = 0; i < this.children.length; ++i)
             this.children[i].revealed = x && this.expanded;
     },
 
     get depth()
     {
         if ("_depth" in this)
             return this._depth;
         if (this.parent && !this.parent._isRoot)
@@ skipping 537 matching lines @@
 
 WebInspector.CreationDataGridNode.prototype = {
     makeNormal: function()
     {
         delete this.isCreationNode;
         delete this.makeNormal;
     },
 
     __proto__: WebInspector.DataGridNode.prototype
 }