Change record status: 
Project: 
Introduced in branch: 
8.x
Description: 

D7

aggregator_remove($feed);
aggregator_refresh($feed);

D8

$feed->deleteItems();
$feed->refreshItems();
Impacts: 
Module developers
Updates Done (doc team, etc.)
Online documentation: 
Not done
Theming guide: 
Not done
Module developer documentation: 
Not done
Examples project: 
Not done
Coder Review: 
Not done
Coder Upgrade: 
Not done
Other: 
Other updates done