Deletes the old feed items for which extension settings have been created.

  Args:
    client: an AdWordsClient instance.
    feed_item_ids: a list of Feed Item Ids.
    feed: the Feed containing the given Feed Item Ids.

def DeleteOldFeedItems(client, feed_item_ids, feed):
  """Deletes the old feed items for which extension settings have been created.

  Args:
    client: an AdWordsClient instance.
    feed_item_ids: a list of Feed Item Ids.
    feed: the Feed containing the given Feed Item Ids.
  """
  if not feed_item_ids:
    return

  feed_item_service = client.GetService('FeedItemService', 'v201809')

  operations = [{
      'operator': 'REMOVE',
      'operand': {
          'feedId': feed['id'],
          'feedItemId': feed_item_id
      }
  } for feed_item_id in feed_item_ids]

  feed_item_service.mutate(operations)