[Merge] lp:~abreu-alexandre/webbrowser-app/simple-user-agent-override into lp:webbrowser-app

[Olivier Tilloy]

Functional testing is ok.
-- 
https://code.launchpad.net/~abreu-alexandre/webbrowser-app/simple-user-agent-override/+merge/236030
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~abreu-alexandre/webbrowser-app/simple-user-agent-override into lp:webbrowser-app.