[DevTools] Rework some focus code.

third_party/WebKit/Source/devtools/front_end/elements/ElementsTreeOutline.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2008 Matt Lilek <webkit@mattlilek.com>
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * 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
@@ skipping 137 matching lines @@
     {
         return this._treeElementSymbol;
     },
 
     focus: function()
     {
         this._element.focus();
     },
 
     /**
-     * @return {boolean}
-     */
-    hasFocus: function()
-    {
-        return this._element === WebInspector.currentFocusElement();
-    },
-
-    /**
      * @param {boolean} wrap
      */
     setWordWrap: function(wrap)
     {
         this._element.classList.toggle("elements-tree-nowrap", !wrap);
     },
 
     /**
      * @return {!WebInspector.DOMModel}
      */
@@ skipping 1621 matching lines @@
             if (node) {
                 this.treeOutline._selectedDOMNode = node;
                 this.treeOutline._selectedNodeChanged();
             }
         }
         return true;
     },
 
     __proto__: TreeElement.prototype
 }