Convert Event#keyIdentifier (deprecated) to Event#key

ui/webui/resources/js/cr/ui/menu_button.js

Index: ui/webui/resources/js/cr/ui/menu_button.js
diff --git a/ui/webui/resources/js/cr/ui/menu_button.js b/ui/webui/resources/js/cr/ui/menu_button.js
index 3a7bae5fc7897f71693d938c465f66fbbe4299f7..ff6c256045cfd448f91193e8254ffb2992c97d5b 100644
--- a/ui/webui/resources/js/cr/ui/menu_button.js
+++ b/ui/webui/resources/js/cr/ui/menu_button.js
@@ -266,20 +266,19 @@ cr.define('cr.ui', function() {
      * Handles the keydown event for the menu button.
      */
     handleKeyDown: function(e) {
-      switch (e.keyIdentifier) {
-        case 'Down':
-        case 'Up':
+      switch (e.key) {
+        case 'ArrowDown':
+        case 'ArrowUp':
           if (!this.respondToArrowKeys)
             break;
         case 'Enter':
-        case 'U+0020': // Space
+        case ' ':
           if (!this.isMenuShown())
             this.showMenu(true);
           e.preventDefault();
           break;
-        case 'Esc':
-        case 'U+001B': // Maybe this is remote desktop playing a prank?
-        case 'U+0009': // Tab
+        case 'Escape':
+        case 'Tab':
           this.hideMenu();
           break;
       }