[Merge] lp:~ahayzen/webbrowser-app/migrate-to-tabs-component into lp:webbrowser-app/staging

[Olivier Tilloy]

> QQmlContext: Cannot set context object on invalid context.
> QQmlComponent: Cannot create a component in an invalid context

Not seeing those any longer after closing all tabs and starting again the app.
-- 
https://code.launchpad.net/~ahayzen/webbrowser-app/migrate-to-tabs-component/+merge/312340
Your team Ubuntu Phablet Team is subscribed to branch lp:webbrowser-app/staging.