downloads: add the ability to undo download removal.

ui/webui/resources/js/cr/ui/command.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.
 
 /**
  * @fileoverview A command is an abstraction of an action a user can do in the
  * UI.
  *
  * When the focus changes in the document for each command a canExecute event
  * is dispatched on the active element. By listening to this event you can
@@ skipping 139 matching lines @@
      * Whether the event object matches the shortcut for this command.
      * @param {!Event} e The key event object.
      * @return {boolean} Whether it matched or not.
      */
     matchesEvent: function(e) {
       if (!this.keyboardShortcuts_)
         return false;
 
       return this.keyboardShortcuts_.some(function(keyboardShortcut) {
         return keyboardShortcut.matchesEvent(e);
-        });
-      }
+      });
+    },
   };
 
   /**
    * The label of the command.
    */
   cr.defineProperty(Command, 'label', cr.PropertyKind.ATTR);
 
   /**
    * Whether the command is disabled or not.
    */
@@ skipping 149 matching lines @@
       this.preventDefault();
     }
   };
 
   // Export
   return {
     Command: Command,
     CanExecuteEvent: CanExecuteEvent
   };
 });