delete method
Deletes a line item.
Returns error code NOT_FOUND if the line item does not exist. The line
item should be archived first, i.e. set entity_status to
ENTITY_STATUS_ARCHIVED, to be able to delete it. YouTube & Partners line
items cannot be created or updated using the API.
Request parameters:
advertiserId - The ID of the advertiser this line item belongs to.
Value must have pattern ^\[^/\]+$.
lineItemId - The ID of the line item to delete.
Value must have pattern ^\[^/\]+$.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a Empty.
Completes with a commons.ApiRequestError if the API endpoint returned an error.
If the used http.Client completes with an error when making a REST call,
this method will complete with the same error.
Implementation
async.Future<Empty> delete(
  core.String advertiserId,
  core.String lineItemId, {
  core.String? $fields,
}) async {
  final queryParams_ = <core.String, core.List<core.String>>{
    if ($fields != null) 'fields': [$fields],
  };
  final url_ = 'v4/advertisers/' +
      core.Uri.encodeFull('$advertiserId') +
      '/lineItems/' +
      core.Uri.encodeFull('$lineItemId');
  final response_ = await _requester.request(
    url_,
    'DELETE',
    queryParams: queryParams_,
  );
  return Empty.fromJson(response_ as core.Map<core.String, core.dynamic>);
}