public MenuLinkInterface::deleteLink()
Deletes a menu link.
In general, this method should not be called directly, but will be called automatically from MenuLinkManagerInterface::removeDefinition().
This method will only delete the link from any additional storage, but not from the plugin.manager.menu.link service.
\Drupal\Component\Plugin\Exception\PluginException If the link is not deletable.
public function deleteLink();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Menu!MenuLinkInterface.php/function/MenuLinkInterface::deleteLink/8.1.x