Allow comments in extension config files.

chrome/common/extensions/api/contentSettings.json

+// 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.
+
 [
   {
     "namespace": "contentSettings",
     "types": [
       {
         "id": "ResourceIdentifier",
         "type": "object",
         "properties": {
           "id": {
             "type": "string",
@@ skipping 197 matching lines @@
         "$ref": "ContentSetting",
         "description": "Whether to allow sites to show desktop notifications. One of<br><var>allow</var>: Allow sites to show desktop notifications,<br><var>block</var>: Don't allow sites to show desktop notifications,<br><var>ask</var>: Ask when a site wants to show desktop notifications. <br>Default is <var>ask</var>.<br>The primary URL is the main-frame URL. The secondary URL is not used.",
         "value": [
           "notifications",
           {"type":"string", "enum": ["allow", "block", "ask"]}
         ]
       }
     }
   }
 ]