Can't submit AR-11 form in egov.uscis.gov unless filling out optional fields

Add site-specific-quirk for egov.uscis.gov so that we ignore required="no".
We tried to contact the web master of egov.uscis.gov. But it didn't work well.

BUG=154611

Review URL: https://chromiumcodereview.appspot.com/17514010

git-svn-id: svn://svn.chromium.org/blink/trunk@152929 bbb929c8-8fbe-4397-9dbb-9b2b20218538