[Merge] lp:~fboucault/webbrowser-app/embed_ui_extras into lp:webbrowser-app/staging

[Olivier Tilloy]

Review: Needs Fixing

Please use the prime keyword to whitelist only the files we want to ship in the snap, probably only 

usr/lib/*/qt5/qml/Ubuntu/Components/Extras

unless I’m forgetting something else?
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https://code.launchpad.net/~fboucault/webbrowser-app/embed_ui_extras/+merge/317641
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