FOS\UserBundle\Model\UserManagerInterface::updatePassword PHP Method

    function updatePassword(UserInterface $user);

 /**
  * This must be called on prePersist and preUpdate if the event is about a
  * user.
  *
  * @param UserInterface $user
  */
 protected function updateUserFields(UserInterface $user)
 {
     if (null === $this->userManager) {
         $this->userManager = $this->container->get('fos_user.user_manager');
     }
     $this->userManager->updateCanonicalFields($user);
     $this->userManager->updatePassword($user);
 }