[Merge] lp:~osomon/webbrowser-app/broken-lock into lp:webbrowser-app

[Michael Sheldon]

Review: Approve

Looks good to me, the only possible addition that might be worth considering is adding a brief description to the certificate pop-up for the broken padlock like we currently have for the insecure content warning.
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https://code.launchpad.net/~osomon/webbrowser-app/broken-lock/+merge/247061
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