Fix typo in css3/filters/effect-reference-ordering{-hw}.html

This removes a stray semi-colon that was causing a filter function
to get ignored.

BUG=none
R=senorblanco@chromium.org

Review URL: https://codereview.chromium.org/19843002

git-svn-id: svn://svn.chromium.org/blink/trunk@154649 bbb929c8-8fbe-4397-9dbb-9b2b20218538