DevTools: Add JSDoc for static methods, fix JSDoc types and induced errors

Source/devtools/front_end/ui/SidebarPane.js

 /*
  * Copyright (C) 2007 Apple 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 108 matching lines @@
     this.element.appendChild(this._pane.titleElement);
 
     this._pane.setExpandCallback(this._expand.bind(this));
 }
 
 WebInspector.SidebarPaneTitle.prototype = {
 
     _expand: function()
     {
         this.element.classList.add("expanded");
-        this._pane.show(this.element.parentNode, this.element.nextSibling);
+        this._pane.show(this.element.parentElement, /** @type {?Element} */ (this.element.nextSibling));
     },
 
     _collapse: function()
     {
         this.element.classList.remove("expanded");
         if (this._pane.element.parentNode == this.element.parentNode)
             this._pane.detach();
     },
 
     _toggleExpanded: function()
     {
         if (this.element.classList.contains("expanded"))
             this._collapse();
         else
             this._pane.expand();
     },
 
     /**
-     * @param {!Event} event
+     * @param {?Event} event
      */
     _onTitleKeyDown: function(event)
     {
         if (isEnterKey(event) || event.keyCode === WebInspector.KeyboardShortcut.Keys.Space.code)
             this._toggleExpanded();
     }
 }
 
 /**
  * @constructor
@@ skipping 39 matching lines @@
     {
         var title = pane.title();
         this.appendTab(title, title, pane);
         pane.element.appendChild(pane.titleElement);
         pane.setExpandCallback(this.selectTab.bind(this, title));
 
     },
 
     __proto__: WebInspector.TabbedPane.prototype
 }