Asynchronously retrieve a list of the identifiers for all the stored filters.
When the operation is finished, @callback will be invoked, which then can use
webkit_user_content_filter_store_fetch_identifiers_finish() to obtain the list of
filter identifiers.
Asynchronously retrieve a list of the identifiers for all the stored filters.
When the operation is finished, @callback will be invoked, which then can use webkit_user_content_filter_store_fetch_identifiers_finish() to obtain the list of filter identifiers.