Delete media/video-frame-size-change.html as it covers the defunct painting path.

The existing compositing/video-frame-size-change.html layout test provides the coverage for the compositing path.

BUG=354168
R=enne@chromium.org

Review URL: https://codereview.chromium.org/208703002

git-svn-id: svn://svn.chromium.org/blink/trunk@169758 bbb929c8-8fbe-4397-9dbb-9b2b20218538