DevTools: Get rid of Element.prototype.enableStyleClass

Source/devtools/front_end/Drawer.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * 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.
@@ skipping 282 matching lines @@
         this._drawerEditor.installedIntoDrawer();
     },
 
     /**
      * @param {boolean} available
      */
     setDrawerEditorAvailable: function(available)
     {
         if (!WebInspector.experimentsSettings.showEditorInDrawer.isEnabled())
             available = false;
-        this._toggleDrawerEditorButton.element.enableStyleClass("hidden", !available);
+        this._toggleDrawerEditorButton.element.classList.toggle("hidden", !available);
     },
 
     showDrawerEditor: function()
     {
         if (!WebInspector.experimentsSettings.showEditorInDrawer.isEnabled())
             return;
 
         this._splitView.showBoth();
         this._drawerEditorSplitView.showBoth();
     },
@@ skipping 61 matching lines @@
 }
 
 WebInspector.DrawerEditor.prototype = {
     /**
      * @return {!WebInspector.View}
      */
     view: function() { },
 
     installedIntoDrawer: function() { },
 }