Remove the use of :-webkit-full-screen-document.

This is a pseudo class that is not implemented by Gecko nor IE, while the
ancestor variant is implemented prefixed by Gecko.

It would be good to remove this. As a first step get rid of the use in the
UA style.

This selector:

:root:-webkit-full-screen-document:not(:-webkit-full-screen)

matches a subset of this:

:root:-webkit-full-screen-ancestor

which means we can just remove the former.

Use counters are added for fullscreen pseudo classes. The ancestor and
document variants are no longer in the spec. Let's see if we can remove them
further down the road.

R=jchaffraix@chromium.org,philipj@opera.com
BUG=442239
TEST=LayoutTests/fullscreen/
NOTRY=true

Review URL: https://codereview.chromium.org/807473002

git-svn-id: svn://svn.chromium.org/blink/trunk@187369 bbb929c8-8fbe-4397-9dbb-9b2b20218538
3 files changed