get_all_cookies
Description:
[ Version ( since = "2.42" ) ]
public async List<Cookie> get_all_cookies (Cancellable? cancellable = null) throws Error
  public async List<Cookie> get_all_cookies (Cancellable? cancellable = null) throws Error
Asynchronously get a list of Cookie from this.
When the operation is finished, callback will be called. You can then call get_all_cookies.end to get 
      the result of the operation.
Parameters:
| this | |
| cancellable | a Cancellable or null to ignore | 
| callback | (closure user_data): a TaskReadyCallback to call when the request is satisfied | 
| user_data | the data to pass to callback function |