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

[Leo Arias]

Tests are looking good. With your latest change, there's one small refactor we can do on the existing helper to split the methods around instead of making the Browser page bigger:

https://code.launchpad.net/~canonical-platform-qa/webbrowser-app/webbrowser-app-private_browsing-refactor_tests-2/+merge/259073
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https://code.launchpad.net/~artmello/webbrowser-app/webbrowser-app-private_browsing/+merge/257673
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