Mark new tab tests as flaky.
Mark new tab tests as flaky.

BUG=69940
TEST=new tab failures don't cause build failures
TBR=nsylvain@chromium.org

Review URL: http://codereview.chromium.org/6277008

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@71712 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser