[Merge] lp:~abreu-alexandre/webbrowser-app/improve-redirection-prefix into lp:webbrowser-app

[Alexandre Abreu]

> A quick grep through the code base seems to indicate that the
> 'isValidContainedUrl' function is not used anywhere? Is this expected? Can’t
> it be removed?

It could yes here,
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https://code.launchpad.net/~abreu-alexandre/webbrowser-app/improve-redirection-prefix/+merge/234325
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