Mark MediaTest.VideoBearSilentTheora as flaky.
Mark MediaTest.VideoBearSilentTheora as flaky.

BUG=51969
TEST=MediaTest.VideoBearSilentTheora

Review URL: http://codereview.chromium.org/3155009

git-svn-id: http://src.chromium.org/svn/trunk/src@55920 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 21eb651b370e4312ff2e4bcb5d2981b2bcc0cfaf
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser