Remove the use of KeyEvent.keyIdentifier.

ui/file_manager/file_manager/foreground/js/directory_tree_naming_controller.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * Naming controller for directory tree.
  * @param {!DirectoryModel} directoryModel
  * @param {!DirectoryTree} directoryTree
  * @param {!cr.ui.dialogs.AlertDialog} alertDialog
  * @constructor
@@ skipping 172 matching lines @@
 };
 
 /**
  * Handles keydown event.
  * @param {!Event} event
  * @private
  */
 DirectoryTreeNamingController.prototype.onKeyDown_ = function(event) {
   event.stopPropagation();
 
-  switch (util.getKeyModifiers(event) + event.keyIdentifier) {
-    case 'U+001B':  // Escape
+  switch (util.getKeyModifiers(event) + event.key) {
+    case 'Escape':
       this.cancelRename_();
       event.preventDefault();
       break;
 
     case 'Enter':
       this.commitRename_();
       event.preventDefault();
       break;
   }
 };