@delete

Description:

public async bool @delete (Source source, Cancellable? cancellable) throws Error

Asynchronously deletes any previously stored credentials for source.

When the operation is finished, callback will be called. You can then call @delete.end to get the result of the operation.

this	an SourceCredentialsProvider
source	an Source, to lookup credentials for
cancellable	optional Cancellable object, or `null`
callback	a TaskReadyCallback to call when the request is satisfied
user_data	data to pass to the callback function