Remove the use of KeyEvent.keyIdentifier.

ui/file_manager/file_manager/foreground/js/ui/file_table.js

Index: ui/file_manager/file_manager/foreground/js/ui/file_table.js
diff --git a/ui/file_manager/file_manager/foreground/js/ui/file_table.js b/ui/file_manager/file_manager/foreground/js/ui/file_table.js
index c55d94dd4df21457307ac62d9e8580d00cf7d648..3ed3a3fac911da998065540b5a06a086af7f3c3d 100644
--- a/ui/file_manager/file_manager/foreground/js/ui/file_table.js
+++ b/ui/file_manager/file_manager/foreground/js/ui/file_table.js
@@ -1234,7 +1234,7 @@ filelist.handleKeyDown = function(e) {
       if (e.keyCode == SPACE_KEY_CODE)
         return;
     // Protect all but the most basic navigation commands in anything else.
-    } else if (e.keyIdentifier != 'Up' && e.keyIdentifier != 'Down') {
+    } else if (e.key != 'ArrowUp' && e.key != 'ArrowDown') {
       return;
     }
   }
@@ -1274,28 +1274,28 @@ filelist.handleKeyDown = function(e) {
     }
   }
 
-  switch (e.keyIdentifier) {
+  switch (e.key) {
     case 'Home':
       newIndex = this.getFirstIndex();
       break;
     case 'End':
       newIndex = this.getLastIndex();
       break;
-    case 'Up':
+    case 'ArrowUp':
       newIndex = leadIndex == -1 ?
           this.getLastIndex() : this.getIndexAbove(leadIndex);
       break;
-    case 'Down':
+    case 'ArrowDown':
       newIndex = leadIndex == -1 ?
           this.getFirstIndex() : this.getIndexBelow(leadIndex);
       break;
-    case 'Left':
-    case 'MediaPreviousTrack':
+    case 'ArrowLeft':
+    case 'MediaTrackPrevious':
       newIndex = leadIndex == -1 ?
           this.getLastIndex() : this.getIndexBefore(leadIndex);
       break;
-    case 'Right':
-    case 'MediaNextTrack':
+    case 'ArrowRight':
+    case 'MediaTrackNext':
       newIndex = leadIndex == -1 ?
           this.getFirstIndex() : this.getIndexAfter(leadIndex);
       break;