Enable editing of content settings type Notifications.

chrome/browser/resources/options/content_settings_exceptions_area.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.contentSettings', function() {
   /** @const */ var ControlledSettingIndicator =
                     options.ControlledSettingIndicator;
   /** @const */ var InlineEditableItemList = options.InlineEditableItemList;
   /** @const */ var InlineEditableItem = options.InlineEditableItem;
   /** @const */ var ArrayDataModel = cr.ui.ArrayDataModel;
 
   /**
    * Returns whether exceptions list for the type is editable.
    *
    * @param {string} contentType The type of the list.
    */
   function IsEditableType(contentType) {
     // Exceptions of the following lists are not editable for now.
-    return !(contentType == 'notifications' ||
-             contentType == 'location' ||
+    return !(contentType == 'location' ||
              contentType == 'fullscreen' ||
              contentType == 'media-stream-mic' ||
              contentType == 'media-stream-camera' ||
              contentType == 'midi-sysex' ||
              contentType == 'zoomlevels');
   }
 
   /**
    * Creates a new exceptions list item.
    *
@@ skipping 624 matching lines @@
     }
   };
 
   return {
     ExceptionsListItem: ExceptionsListItem,
     ExceptionsAddRowListItem: ExceptionsAddRowListItem,
     ExceptionsList: ExceptionsList,
     ContentSettingsExceptionsArea: ContentSettingsExceptionsArea,
   };
 });