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

[Olivier Tilloy]

Review: Needs Fixing

The open_new_tab() helper method doesn’t need an additional 'incognito' parameter. The value of incognito can be gotten from self.main_window.incognito.
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https://code.launchpad.net/~artmello/webbrowser-app/webbrowser-app-private_browsing/+merge/259388
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