Allow comments in extension config files.

chrome/common/extensions/api/fileBrowserPrivate.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":"fileBrowserPrivate",
     "nodoc": "true",
     "types": [
       {
         "id": "FileBrowserTask",
         "type": "object",
         "description": "Represents information about available browser tasks. A task is an abstraction of an operation that the file browser can perform over a selected file set.",
         "properties": {
@@ skipping 560 matching lines @@
           {
             "$ref": "FileWatchEvent",
             "name": "event",
             "description": "File watch event information."
           }
         ]
       }
     ]
   }
 ]