Allow comments in extension config files.

chrome/common/extensions/api/experimental.socket.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": "experimental.socket",
     "nodoc": true,
     "types": [
       {
         "id": "SocketEvent",
         "type": "object",
         "description": "A socket event.",
         "properties": {
@@ skipping 218 matching lines @@
             "name": "event",
             "$ref": "SocketEvent",
             "description": "The event indicating socket status."
           }
         ],
         "description": "Used to pass events back to the socket creator."
       }
     ]
   }
 ]