Eradicate keyIndentifier from devtools/*

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 866 matching lines @@
     handleShortcut: function(event)
     {
         var node = this.selectedDOMNode();
         if (!node)
             return;
         var treeElement = node[this._treeElementSymbol];
         if (!treeElement)
             return;
 
         if (WebInspector.KeyboardShortcut.eventHasCtrlOrMeta(event) && node.parentNode) {
-            if (event.keyIdentifier === "Up" && node.previousSibling) {
+            if (event.key === "ArrowUp" && node.previousSibling) {
                 node.moveTo(node.parentNode, node.previousSibling, this.selectNodeAfterEdit.bind(this, treeElement.expanded));
                 event.handled = true;
                 return;
             }
-            if (event.keyIdentifier === "Down" && node.nextSibling) {
+            if (event.key === "ArrowDown" && node.nextSibling) {
                 node.moveTo(node.parentNode, node.nextSibling.nextSibling, this.selectNodeAfterEdit.bind(this, treeElement.expanded));
                 event.handled = true;
                 return;
             }
         }
     },
 
     /**
      * @param {!WebInspector.DOMNode} node
      * @param {boolean=} startEditing
@@ skipping 879 matching lines @@
             if (node) {
                 this.treeOutline._selectedDOMNode = node;
                 this.treeOutline._selectedNodeChanged();
             }
         }
         return true;
     },
 
     __proto__: TreeElement.prototype
 }