[Merge] lp:~canonical-platform-qa/camera-app/fix_base_class into lp:camera-app

[Max Brustkern]

This seems reasonable to me once the CI jobs stop failing.
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https://code.launchpad.net/~canonical-platform-qa/camera-app/fix_base_class/+merge/257658
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~canonical-platform-qa/camera-app/fix_base_class into lp:camera-app.