code: function clearPermissions (resourceUrl, webClient) {
    var aclResourceUrl
    return webClient.head(resourceUrl)
      .then((response) => {
        aclResourceUrl = response.aclAbsoluteUrl()
        if (!aclResourceUrl) {
          throw new Error('ACL URL not found for resource.')
        }
        return webClient.del(aclResourceUrl)
      })
  }
docs: Clears (deletes) an ACL resource for a given resource url.
  Usage:
  
  ```
  solid.clearPermissions('https://alice.example.com/docs/file1')
  .then(function (result) {
  // Now the ACL resource at file1.acl is deleted
  })
  ```
  @method clearPermissions
  @param resourceUrl {String} URL of a resource (not its ACL)
  @return {Promise<PermissionSet>}