Convert Event#keyIdentifier (deprecated) to Event#key

ui/webui/resources/js/cr/ui/focus_grid.js

 // Copyright 2014 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() {
   /**
    * A class to manage grid of focusable elements in a 2D grid. For example,
    * given this grid:
    *
    *   focusable  [focused]  focusable  (row: 0, col: 1)
@@ skipping 35 matching lines @@
       this.rows.forEach(function(r) { r.makeActive(r == row); });
     },
 
     /** @override */
     onKeydown: function(row, e) {
       var rowIndex = this.rows.indexOf(row);
       assert(rowIndex >= 0);
 
       var newRow = -1;
 
-      if (e.keyIdentifier == 'Up')
+      if (e.key == 'ArrowUp')
         newRow = rowIndex - 1;
-      else if (e.keyIdentifier == 'Down')
+      else if (e.key == 'ArrowDown')
         newRow = rowIndex + 1;
-      else if (e.keyIdentifier == 'PageUp')
+      else if (e.key == 'PageUp')
         newRow = 0;
-      else if (e.keyIdentifier == 'PageDown')
+      else if (e.key == 'PageDown')
         newRow = this.rows.length - 1;
 
       var rowToFocus = this.rows[newRow];
       if (rowToFocus) {
         this.ignoreFocusChange_ = true;
         rowToFocus.getEquivalentElement(this.lastFocused_).focus();
         e.preventDefault();
         return true;
       }
 
@@ skipping 80 matching lines @@
       }
 
       this.rows[0].makeActive(true);
     },
   };
 
   return {
     FocusGrid: FocusGrid,
   };
 });