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.UserContentFilterStore.fetchIdentifiersFinish to obtain the list of filter identifiers.
a #GCancellable or null to ignore
a #GAsyncReadyCallback to call when the removal is completed
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.UserContentFilterStore.fetchIdentifiersFinish to obtain the list of filter identifiers.