How to edit and keep class-wc-widget-featured-products.php update proof

Within the class-wc-widget-featured-products.php file I need to Remove this on Line 101:
<?php if ( $r->post->post_title ) echo get_the_title( $r->post->ID ); else echo $r->post->ID; ?>

and Remove:
</a> <?php echo $product->get_price_html(); ?>

And change the UL tag to a DIV and delete the li tags, which is fine to do within the core file… but can anyone tell me how I would implement this in the functions file to keep my changes from being deleted with every woocommerce update?

I tried adding the edited file to a woocommerce>classes>widgets file structure but I’ve just read that this only works with template files.

Any help will be great appreciated!!
Thanks

http://wordpress.org/plugins/woocommerce/