title: Set WooCommerce cart expiration
body: <p>I would like to erase the cart content when the woocommerce session expires.
  I can see there's a variable setting the time in class <strong>WC_Session_Handler</strong>, however when it expires, products does not get removed from cart (i guess it behaves like this by design,it's not an error). </p>
  
  <p>So please tell me how can i set the session expiration time for woocommerce cart so, that cart content gets removed when it expires?</p>