Updated TestExpecations: image fail in compositing/video-page-visibility.html

BUG=231357
TBR=wonsik@chromium.org

Review URL: https://codereview.chromium.org/23578007

git-svn-id: svn://svn.chromium.org/blink/trunk@156861 bbb929c8-8fbe-4397-9dbb-9b2b20218538