[Merge] lp:~ahayzen/webbrowser-app/fix-1491279-depend-on-download-manager into lp:webbrowser-app/staging

[Andrew Hayzen]

Updated to use check_call, please retest :-)
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https://code.launchpad.net/~ahayzen/webbrowser-app/fix-1491279-depend-on-download-manager/+merge/309669
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