Marks test as flaky on mac.
Marks test as flaky on mac.

BUG=52022
TEST=none
TBR=davemoore@chromium.org

Review URL: http://codereview.chromium.org/6260037

git-svn-id: http://src.chromium.org/svn/trunk/src@73164 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: fda8f018b6fba8f0d506e8e98b5157506ec7bf3b
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