Remove the use of KeyEvent.keyIdentifier.

ui/file_manager/gallery/js/gallery.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.
 
 /**
  * Overrided metadata worker's path.
  * @type {string}
  */
 ContentMetadataProvider.WORKER_SCRIPT = '/js/metadata_worker.js';
 
@@ skipping 723 matching lines @@
   this.updateSelectionAndState_();
 };
 
 /**
  * Keydown handler.
  *
  * @param {!Event} event
  * @private
  */
 Gallery.prototype.onKeyDown_ = function(event) {
-  var keyString = util.getKeyModifiers(event) + event.keyIdentifier;
+  var keyString = util.getKeyModifiers(event) + event.key;
 
   // Handle debug shortcut keys.
   switch (keyString) {
-    case 'Ctrl-Shift-U+0049': // Ctrl+Shift+I
+    case 'Ctrl-Shift-I': // Ctrl+Shift+I
       chrome.fileManagerPrivate.openInspector('normal');
       break;
-    case 'Ctrl-Shift-U+004A': // Ctrl+Shift+J
+    case 'Ctrl-Shift-J': // Ctrl+Shift+J
       chrome.fileManagerPrivate.openInspector('console');
       break;
-    case 'Ctrl-Shift-U+0043': // Ctrl+Shift+C
+    case 'Ctrl-Shift-C': // Ctrl+Shift+C
       chrome.fileManagerPrivate.openInspector('element');
       break;
-    case 'Ctrl-Shift-U+0042': // Ctrl+Shift+B
+    case 'Ctrl-Shift-B': // Ctrl+Shift+B
       chrome.fileManagerPrivate.openInspector('background');
       break;
   }
 
   // Do not capture keys when share dialog is shown.
   if (this.shareDialog_.isShowing())
     return;
 
   // Show UIs when user types any key.
   this.dimmableUIController_.kick();
 
   // Handle mode specific shortcut keys.
   if (this.currentMode_.onKeyDown(event)) {
     event.preventDefault();
     return;
   }
 
   // Handle application wide shortcut keys.
   switch (keyString) {
-    case 'U+0008': // Backspace.
+    case 'Backspace':
       // The default handler would call history.back and close the Gallery.
       event.preventDefault();
       break;
 
-    case 'U+004D':  // 'm' switches between Slide and Mosaic mode.
+    case 'm':  // 'm' switches between Slide and Mosaic mode.
       if (!this.modeSwitchButton_.disabled)
         this.toggleMode_(undefined, event);
       break;
 
-    case 'U+0056':  // 'v'
+    case 'v':
     case 'MediaPlayPause':
       if (!this.slideshowButton_.disabled) {
         this.slideMode_.startSlideshow(
             SlideMode.SLIDESHOW_INTERVAL_FIRST, event);
       }
       break;
 
-    case 'U+007F':  // Delete
-    case 'Shift-U+0033':  // Shift+'3' (Delete key might be missing).
-    case 'U+0044':  // 'd'
+    case 'Delete':
+    case 'Shift-3':  // Shift+'3' (Delete key might be missing).
+    case 'd':
       if (!this.deleteButton_.disabled)
         this.delete_();
       break;
 
-    case 'U+001B':  // Escape
+    case 'Escape':
       window.close();
       break;
   }
 };
 
 // Name box and rename support.
 
 /**
  * Updates the UI related to the selected item and the persistent state.
  *
@@ skipping 247 matching lines @@
  */
 var initializePromise =
     Promise.all([loadTimeDataPromise, volumeManagerPromise]).
     then(function(args) {
       var volumeManager = args[1];
       gallery = new Gallery(volumeManager);
     });
 
 // Loads entries.
 initializePromise.then(reload);