DevTools: only allow status bar items in status bars.

Source/devtools/front_end/resources/FileSystemView.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 42 matching lines @@
     this._refreshButton.setVisible(true);
     this._refreshButton.addEventListener("click", this._refresh, this);
 
     this._deleteButton = new WebInspector.StatusBarButton(WebInspector.UIString("Delete"), "delete-storage-status-bar-item");
     this._deleteButton.setVisible(true);
     this._deleteButton.addEventListener("click", this._confirmDelete, this);
 }
 
 WebInspector.FileSystemView.prototype = {
     /**
-     * @type {!Array.<!Element>}
+     * @return {!Array.<!WebInspector.StatusBarItem>}
      */
-    get statusBarItems()
+    statusBarItems: function()
     {
-        return [this._refreshButton.element, this._deleteButton.element];
+        return [this._refreshButton, this._deleteButton];
     },
 
     /**
      * @type {!WebInspector.View}
      */
     get visibleView()
     {
         return this._visibleView;
     },
 
@@ skipping 156 matching lines @@
     },
 
     _deletionCompleted: function()
     {
         if (this._entry != this._entry.fileSystem.root)
             this.parent.refresh();
     },
 
     __proto__: TreeElement.prototype
 }