Allow comments in extension config files.

chrome/common/extensions/api/proxy.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": "proxy",
     "dependencies": [ "types" ],
     "types": [
       {
         "id": "ProxyServer",
         "type": "object",
         "description": "An object encapsulating a single proxy server's specification.",
         "properties": {
@@ skipping 72 matching lines @@
                 "type": "string",
                 "description": "Additional details about the error such as a JavaScript runtime error."
               }
             }
           }
         ]
       }
     ]
   }
 ]