[Merge] lp:~abreu-alexandre/webbrowser-app/handle-webapp-renderer-crash into lp:webbrowser-app

[Alexandre Abreu]

Updated according to design's comment; also changed the SadWebview qml name
-- 
https://code.launchpad.net/~abreu-alexandre/webbrowser-app/handle-webapp-renderer-crash/+merge/271865
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~abreu-alexandre/webbrowser-app/handle-webapp-renderer-crash into lp:webbrowser-app.