DevTools: Get rid of Element.prototype.enableStyleClass

Source/devtools/front_end/SourcesPanel.js

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2011 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:
  * 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
@@ skipping 790 matching lines @@
 
         if (sourceFrame && event.data.focusSource)
             sourceFrame.focus();
     },
 
     _pauseOnExceptionEnabledChanged: function()
     {
         var enabled = WebInspector.settings.pauseOnExceptionEnabled.get();
         this._pauseOnExceptionButton.toggled = enabled;
         this._pauseOnExceptionButton.title = WebInspector.UIString(enabled ? "Don't pause on exceptions." : "Pause on exceptions.");
-        this._debugToolbarDrawer.enableStyleClass("expanded", enabled);
+        this._debugToolbarDrawer.classList.toggle("expanded", enabled);
     },
 
     _updateDebuggerButtons: function()
     {
         if (this._paused) {
             this._updateButtonTitle(this._pauseButton, WebInspector.UIString("Resume script execution (%s)."))
             this._pauseButton.state = true;
             this._pauseButton.setLongClickOptionsEnabled((function() { return [ this._longResumeButton ] }).bind(this));
 
             this._pauseButton.setEnabled(true);
@@ skipping 1036 matching lines @@
 {
 }
 
 WebInspector.SourcesPanel.EditorAction.prototype = {
     /**
      * @param {!WebInspector.SourcesPanel} panel
      * @return {!Element}
      */
     button: function(panel) { }
 }