[Merge] lp:~ahayzen/webbrowser-app/add-autopilot-multi-window-tests-001 into lp:webbrowser-app/staging

[Andrew Hayzen]

test_private_window_no_history and test_private_download are now skipped on non-desktop devices, please retest :-)
-- 
https://code.launchpad.net/~ahayzen/webbrowser-app/add-autopilot-multi-window-tests-001/+merge/309678
Your team Ubuntu Phablet Team is subscribed to branch lp:webbrowser-app/staging.