Mark back-send-referrer.html as flaky because it times out sometimes.
Mark back-send-referrer.html as flaky because it times out sometimes.

TBR=zork
BUG=24308
TEST=none
Review URL: http://codereview.chromium.org/264011

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@28407 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