fetch method

Future fetch (dynamic input, [ Map init ])

Implementation 

Future fetch(/*RequestInfo*/ input, [Map init]) {
  var init_dict = null;
  if (init != null) {
    init_dict = convertDartToNative_Dictionary(init);
  }
  return promiseToFuture(JS("", "#.fetch(#, #)", this, input, init_dict));
}