`nsILocalFile` should be replaced with `nsIFile` in our extensions

Warning: Starting with Gecko 14, `nsILocalFile` inherits all functions and attributes from `nsIFile`, meaning that you no longer need to use `nsILocalFile`. If your add-on doesn't support versions older than 14, you should use `nsIFile` instead of `nsILocalFile`.

See bug https://bugzilla.mozilla.org/show_bug.cgi?id=682360 for more information.
components/tl-protocol.js
{
  var file = Cc['@mozilla.org/file/local;1'].createInstance(Ci.nsILocalFile);
  file.initWithPath(aPath);