Gardening: svg/repaint/image-with-clip-path.svg fails on Mac

BUG=369419
TBR=enne

Review URL: https://codereview.chromium.org/260903016

git-svn-id: svn://svn.chromium.org/blink/trunk@173184 bbb929c8-8fbe-4397-9dbb-9b2b20218538