[Merge] lp:~abreu-alexandre/webbrowser-app/intent into lp:webbrowser-app

[Olivier Tilloy]

In IntentFilter::isValidIntentFilterResult(…), the checks expect the result to have a host, but in the declaration of the IntentUriDescription struct, 'host' is marked optional. So, is it optional or required?
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https://code.launchpad.net/~abreu-alexandre/webbrowser-app/intent/+merge/247421
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