[Merge] lp:~canonical-platform-qa/webbrowser-app/autopkgtest into lp:webbrowser-app

[Olivier Tilloy]

@vila: migration of oxide 1.7.7 from proposed to release was blocked on some autopkgtest failure, it has now been resolved.
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https://code.launchpad.net/~canonical-platform-qa/webbrowser-app/autopkgtest/+merge/256858
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