[Merge] lp:~michael-sheldon/webbrowser-app/implement-download-folder into lp:webbrowser-app

[Olivier Tilloy]

Review: Needs Fixing

The runtime dependency on qml-module-qtquick-dialogs should be removed, now that FilePickerDialog.qml was removed.
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https://code.launchpad.net/~michael-sheldon/webbrowser-app/implement-download-folder/+merge/268815
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