Still one failing media test on mac 10.9 after r182122.

TBR=sherkus@chromium.org
BUG=414649

Review URL: https://codereview.chromium.org/576903002

git-svn-id: svn://svn.chromium.org/blink/trunk@182127 bbb929c8-8fbe-4397-9dbb-9b2b20218538