/**
  * {@inheritDoc}
  */
 public function loadUserByUsername($username)
 {
     // Compatibility with FOSUserBundle < 2.0
     if (class_exists('FOS\\UserBundle\\Form\\Handler\\RegistrationFormHandler')) {
         return $this->userManager->loadUserByUsername($username);
     }
     return $this->userManager->findUserByUsername($username);
 }