[Merge] lp:~artmello/webbrowser-app/webbrowser-app-multi_window into lp:webbrowser-app

[Olivier Tilloy]

Review: Disapprove

Superseded by https://code.launchpad.net/~system-apps-team/webbrowser-app/multiple-windows/+merge/303310.
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https://code.launchpad.net/~artmello/webbrowser-app/webbrowser-app-multi_window/+merge/272681
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