woothemes/woocommerce — pull request #4104 by corsonr (2013-11-13 14:25:06+00:00)
Title: Apply_filters on checkout form enctype fix

Apply_filters on checkout form enctype and class to allow third party plugins to use file input type during checkout process. Form class needs to be removed for $FILES to work, that's why applyfilters is needed on the form class.