Fix a bug where an extension's icon was not being properly updated.

chrome/browser/resources/extensions/extension_list.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.
 
 cr.define('options', function() {
   'use strict';
 
   /**
    * A lookup helper function to find the first node that has an id (starting
    * at |node| and going up the parent chain).
@@ skipping 79 matching lines @@
         node.classList.add('inactive-extension');
 
       if (!extension.userModifiable)
         node.classList.add('may-not-disable');
 
       var idToHighlight = this.getIdQueryParam_();
       if (node.id == idToHighlight)
         node.classList.add('extension-highlight');
 
       var item = node.querySelector('.extension-list-item');
-      item.style.backgroundImage = 'url(' + extension.icon + ')';
+      item.style.backgroundImage = 'url(' + extension.icon + '?' +
+                                   extension.imageId + ')';
 
       var title = node.querySelector('.extension-title');
       title.textContent = extension.name;
 
       var version = node.querySelector('.extension-version');
       version.textContent = extension.version;
 
       var locationText = node.querySelector('.location-text');
       locationText.textContent = extension.locationText;
 
@@ skipping 203 matching lines @@
       }
 
       this.appendChild(node);
     }
   };
 
   return {
     ExtensionsList: ExtensionsList
   };
 });