[Merge] lp:~uriboni/webbrowser-app/media-access into lp:webbrowser-app

[Olivier Tilloy]

The browser is now running under apparmor confinement, so we need to add the 'microphone' and 'camera' policy groups to debian/webbrowser-app-apparmor.manifest.
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https://code.launchpad.net/~uriboni/webbrowser-app/media-access/+merge/272919
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