DevTools: Get rid of Element.prototype.enableStyleClass

Source/devtools/front_end/OverridesView.js

 /*
  * Copyright (C) 2014 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 52 matching lines @@
      * @param {!WebInspector.Event} event
      */
     _tabSelected: function(event)
     {
         this._lastSelectedTabSetting.set(this._tabbedPane.selectedTabId);
     },
 
     _overridesWarningUpdated: function()
     {
         var message = WebInspector.overridesSupport.warningMessage();
-        this._warningFooter.enableStyleClass("hidden", !message);
+        this._warningFooter.classList.toggle("hidden", !message);
         this._warningFooter.textContent = message;
     },
 
     __proto__: WebInspector.View.prototype
 }
 
 /**
  * @constructor
  * @extends {WebInspector.View}
  * @param {string} id
@@ skipping 19 matching lines @@
         this._tabbedPane = tabbedPane;
         tabbedPane.appendTab(this._id, this._name, this);
         this._updateActiveState();
     },
 
     _updateActiveState: function()
     {
         var active = false;
         for (var i = 0; !active && i < this._settings.length; ++i)
             active = this._settings[i].get();
-        this._tabbedPane.element.enableStyleClass("overrides-activate-" + this._id, active);
+        this._tabbedPane.element.classList.toggle("overrides-activate-" + this._id, active);
         this._tabbedPane.changeTabTitle(this._id, active ? this._name + " \u2713" : this._name);
     },
 
     /**
      * Creates an input element under the parentElement with the given id and defaultText.
      * It also sets an onblur event listener.
      * @param {!Element} parentElement
      * @param {string} id
      * @param {string} defaultText
      * @param {function(*)} eventListener
@@ skipping 965 matching lines @@
 
     __proto__ : WebInspector.OverridesView.Tab.prototype
 }
 
 /** @enum {string} */
 WebInspector.OverridesView.SensorsTab.DeviceOrientationModificationSource = {
     UserInput: "userInput",
     UserDrag: "userDrag",
     ResetButton: "resetButton"
 }