DevTools: Use real focus in TreeOutline

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 92 matching lines @@
     this.update();
   }
 
   /**
    * @return {symbol}
    */
   treeElementSymbol() {
     return this._treeElementSymbol;
   }
 
-  /**
-   * @override
-   */
-  focus() {
-    this._element.focus();
-  }
 
   /**
    * @param {boolean} wrap
    */
   setWordWrap(wrap) {
     this._element.classList.toggle('elements-tree-nowrap', !wrap);
   }
 
   /**
    * @return {!SDK.DOMModel}
@@ skipping 1565 matching lines @@
      */
     function resolved(node) {
       if (node) {
         this.treeOutline._selectedDOMNode = node;
         this.treeOutline._selectedNodeChanged();
       }
     }
     return true;
   }
 };