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

[Olivier Tilloy]

The rest of the changes look good. I’ve just tested on arale, and I’m not seeing any video devices listed in the settings (even with oxide 1.10.2 installed from the phablet-team PPA). Have you managed to validate that camera devices are listed on another device?
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https://code.launchpad.net/~uriboni/webbrowser-app/media-access/+merge/272919
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