[Merge] lp:~kdub/content-hub/mir-deprecations into lp:content-hub

[Alberto Mardegan]

Thanks Kevin! For the record, I applied the same changes to Online Accounts (minus cosmetic changes):

https://code.launchpad.net/~mardy/ubuntu-system-settings-online-accounts/mir-deprecations/+merge/317949

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https://code.launchpad.net/~kdub/content-hub/mir-deprecations/+merge/317770
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~kdub/content-hub/mir-deprecations into lp:content-hub.