Asynchronously remove a content filter given its identifier.
When the operation is finished, callback will be invoked, which then can use remove.end to check
whether the removal was successful.
| this | |
| identifier |
a filter identifier |
| cancellable |
a Cancellable or null to ignore |
| callback |
a TaskReadyCallback to call when the removal is completed |
| user_data |
the data to pass to the callback function |