Unreviewed gardening

media/media-constants.html is flaky on all platforms:
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=media%2Fmedia-constants.html

TBR=
BUG=

Review URL: https://codereview.chromium.org/19726006

git-svn-id: svn://svn.chromium.org/blink/trunk@154771 bbb929c8-8fbe-4397-9dbb-9b2b20218538