Mark a test as flaky on mac.
Mark a test as flaky on mac.

TBR=brettw

Review URL: http://codereview.chromium.org/159734


git-svn-id: http://src.chromium.org/svn/trunk/src@22196 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: a2ad3e7aae263ba90ec79daa493d97012009b54c
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