DevTools: Get rid of Element.prototype.enableStyleClass

Source/devtools/front_end/StatusBarButton.js

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 51 matching lines @@
 
     get visible()
     {
         return this._visible;
     },
 
     set visible(x)
     {
         if (this._visible === x)
             return;
-        this.element.enableStyleClass("hidden", !x);
+        this.element.classList.toggle("hidden", !x);
         this._visible = x;
     },
 
     __proto__: WebInspector.Object.prototype
 }
 
 /**
  * @constructor
  * @extends {WebInspector.StatusBarItem}
  * @param {string} text
@@ skipping 135 matching lines @@
     {
         return this._state;
     },
 
     set state(x)
     {
         if (this._state === x)
             return;
 
         if (this.states === 2)
-            this.element.enableStyleClass("toggled-on", x);
+            this.element.classList.toggle("toggled-on", x);
         else {
             this.element.classList.remove("toggled-" + this._state);
             if (x !== 0)
                 this.element.classList.add("toggled-" + x);
         }
         this._state = x;
     },
 
     get toggled()
     {
@@ skipping 420 matching lines @@
         var options = [];
         for (var index = 0; index < this._states.length; index++) {
             if (this._states[index] !== this.state && this._states[index] !== this._currentState)
                 options.push(this._buttons[index]);
         }
         return options;
     },
 
     __proto__: WebInspector.StatusBarButton.prototype
 }