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

[Olivier Tilloy]

And one additional point that Chris raised during our oxide weekly call: remembering permissions should only be done when browsing in public mode, incognito mode should not leave a trace of the user’s actions. No big deal now that this logic is moving to oxide, the incognito check will be handled there.
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https://code.launchpad.net/~uriboni/webbrowser-app/media-access/+merge/272919
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