Allow comments in extension config files.

chrome/common/extensions/api/chromePrivate.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": "chromePrivate",
     "nodoc": "true",
     "functions": [
       {
         "name": "decodeJPEG",
         "description": "Decodes JPEG image array to raw bitmap array",
         "parameters": [
           {
             "name": "jpeg_image",
             "type": "array",
             "optional": false,
             "description": "The JPEG image bytes array",
             "items": {"type": "number"}
           }
         ],
         "returns": {
           "type": "array",
           "description": "Decoded bitmap RGB array formatted as (B | G << 8 | R << 16)",
           "items": {"type": "number"}
         }
       }
     ]
   }
 ]