Allow comments in extension config files.

chrome/common/extensions/api/webstorePrivate.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":"webstorePrivate",
     "nodoc": "true",
     "functions": [
       {
         "name": "install",
         "description": "Installs the extension corresponding to the given id",
         "parameters": [
           {
@@ skipping 240 matching lines @@
                 "type": "string",
                 "enum": ["webgl_allowed", "webgl_blocked"]
               }
             ]
           }
         ]
       }
     ]
   }
 ]