Convert Event#keyIdentifier (deprecated) to Event#key

ui/webui/resources/js/cr/ui/tree.js

 // Copyright (c) 2012 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.
 
 cr.define('cr.ui', function() {
   // require cr.ui.define
   // require cr.ui.limitInputWidth
 
   /**
    * The number of pixels to indent per level.
@@ skipping 128 matching lines @@
       var itemToSelect;
       if (e.ctrlKey)
         return;
 
       var item = this.selectedItem;
       if (!item)
         return;
 
       var rtl = getComputedStyle(item).direction == 'rtl';
 
-      switch (e.keyIdentifier) {
-        case 'Up':
+      switch (e.key) {
+        case 'ArrowUp':
           itemToSelect = item ? getPrevious(item) :
               this.items[this.items.length - 1];
           break;
-        case 'Down':
+        case 'ArrowDown':
           itemToSelect = item ? getNext(item) :
               this.items[0];
           break;
-        case 'Left':
-        case 'Right':
+        case 'ArrowLeft':
+        case 'ArrowRight':
           // Don't let back/forward keyboard shortcuts be used.
           if (!cr.isMac && e.altKey || cr.isMac && e.metaKey)
             break;
 
-          if (e.keyIdentifier == 'Left' && !rtl ||
-              e.keyIdentifier == 'Right' && rtl) {
+          if (e.key == 'ArrowLeft' && !rtl || e.key == 'ArrowRight' && rtl) {
             if (item.expanded)
               item.expanded = false;
             else
               itemToSelect = findTreeItem(item.parentNode);
           } else {
             if (!item.expanded)
               item.expanded = true;
             else
               itemToSelect = item.items[0];
           }
@@ skipping 376 matching lines @@
       var text = this.label;
       var input;
 
       // Handles enter and escape which trigger reset and commit respectively.
       function handleKeydown(e) {
         // Make sure that the tree does not handle the key.
         e.stopPropagation();
 
         // Calling tree.focus blurs the input which will make the tree item
         // non editable.
-        switch (e.keyIdentifier) {
-          case 'U+001B':  // Esc
+        switch (e.key) {
+          case 'Escape':
             input.value = text;
             // fall through
           case 'Enter':
             self.tree.focus();
         }
       }
 
       function stopPropagation(e) {
         e.stopPropagation();
       }
@@ skipping 115 matching lines @@
     }
     return item;
   }
 
   // Export
   return {
     Tree: Tree,
     TreeItem: TreeItem
   };
 });