[Sheriff] Disable compositing/overflow/clear-scroll-parent.html on mac.
[Sheriff] Disable compositing/overflow/clear-scroll-parent.html on mac.

BUG=298039
TBR= vollick@chromium.org

Review URL: https://codereview.chromium.org/24526002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@158306 bbb929c8-8fbe-4397-9dbb-9b2b20218538

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk