get method
Returns information about the installed extension, app, or theme that has
the given ID.
id The ID from an item of management.ExtensionInfo.
Implementation
Future<ExtensionInfo> get(String id) async {
  var $res =
      await promiseToFuture<$js.ExtensionInfo>($js.chrome.management.get(id));
  return ExtensionInfo.fromJS($res);
}