[Merge] lp:~osomon/webbrowser-app/newTabRefactoring-autopilot-tests into lp:webbrowser-app

[Riccardo Padovani]

Since LP Web UI doesn't work for MR I'm doing this review by mail,
and I'll take more time to check the diff later.

It seems to work well, autopilot tests work good, there aren't flake8 issues
and the code seems ok.

Great work Olivier :-)

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https://code.launchpad.net/~osomon/webbrowser-app/newTabRefactoring-autopilot-tests/+merge/260488
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