DevTools: Get rid of Element.prototype.enableStyleClass

Source/devtools/front_end/FilteredItemSelectionDialog.js

 /*
  * Copyright (C) 2012 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 246 matching lines @@
 
     _onInput: function(event)
     {
         this._shouldShowMatchingItems = this._delegate.shouldShowMatchingItems(this._promptElement.value);
         this._updateShowMatchingItems();
         this._scheduleFilter();
     },
 
     _updateShowMatchingItems: function()
     {
-        this._itemElementsContainer.enableStyleClass("hidden", !this._shouldShowMatchingItems);
+        this._itemElementsContainer.classList.toggle("hidden", !this._shouldShowMatchingItems);
         this.element.style.height = this._shouldShowMatchingItems ? this._dialogHeight + "px" : "auto";
     },
 
     _onKeyDown: function(event)
     {
         var newSelectedIndex = this._selectedIndexInFiltered;
 
         switch (event.keyCode) {
         case WebInspector.KeyboardShortcut.Keys.Down.code:
             if (++newSelectedIndex >= this._filteredItems.length)
@@ skipping 600 matching lines @@
     var filteredItemSelectionDialog = new WebInspector.FilteredItemSelectionDialog(new WebInspector.SelectUISourceCodeForProjectTypeDialog(type, callback));
     filteredItemSelectionDialog.setQuery(name);
     filteredItemSelectionDialog.renderAsTwoRows();
     WebInspector.Dialog.show(relativeToElement, filteredItemSelectionDialog);
 }
 
 /**
  * @typedef {{index: number, total: number, chunk: !Array.<!{selectorText: string, lineNumber: number, columnNumber: number}>}}
  */
 WebInspector.JavaScriptOutlineDialog.MessageEventData;