Add min-width/max-width/min-height/max-height to the fullscreen UA style sheet

The spec has :fullscreen and obviously not :-webkit-full-screen, but
this is the closest thing we can do before unprefixing.

BUG=399543

Review URL: https://codereview.chromium.org/432323002

git-svn-id: svn://svn.chromium.org/blink/trunk@179580 bbb929c8-8fbe-4397-9dbb-9b2b20218538