Allow comments in extension config files.

chrome/common/extensions/api/fileBrowserHandler.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":"fileBrowserHandler",
     "types": [
       {
         "id": "FileHandlerExecuteEventDetails",
         "type": "object",
         "description": "Event details payload for fileBrowserHandler.onExecute event.",
         "properties": {
           "entries": {
@@ skipping 22 matching lines @@
           {
             "name": "details",
             "$ref": "FileHandlerExecuteEventDetails",
             "description": "File handler execute event details."
           }
         ]
       }
     ]
   }
 ]