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

[Olivier Tilloy]

The ContentDownloadDialog.qml implementations don’t need to be an instance of Component, their top-level element can be PopupBase.

The decoupling done at revision 1209 looks good. I suppose you’re aware of it, but just as a reminder to myself: src/app/ContentPickerDialog.qml still breaks encapsulation by referring to 'webapp' and 'browser'.
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https://code.launchpad.net/~michael-sheldon/webbrowser-app/implement-download-folder/+merge/268815
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