[Merge] lp:~rpadovani/webbrowser-app/settings-page into lp:webbrowser-app

[Olivier Tilloy]

Can you please update the visuals of the Search Engine page to match https://docs.google.com/a/canonical.com/presentation/d/1woHjO8K4iqyVZZlfQ4BXL0DhYbwkEmZ7wvcUhYzHDRk/edit#slide=id.g354125fb9_042 ?
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https://code.launchpad.net/~rpadovani/webbrowser-app/settings-page/+merge/253975
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