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

[Olivier Tilloy]

I’m getting the following two warnings in the logs at application startup:

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

I verified that I’m not getting them with the staging branch, so this is new. I wonder what’s causing them, and if they are harmful at all?
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https://code.launchpad.net/~ahayzen/webbrowser-app/migrate-to-tabs-component/+merge/312340
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