Remove background-clip-text-composited.html test suppression.
Remove background-clip-text-composited.html test suppression.

The dashboard is green, we can safely enable this now.

TBR=junov@chromium.org

Review URL: https://chromiumcodereview.appspot.com/15481003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@150687 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