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

[Andrew Hayzen]

Updated this to use content-hub-testability (note you'll need to install the package). And to ensure that the test peer has been registered before the test, in the setUp it runs /usr/lib/*/content-hub/content-hub-peer-hook-wrapper.

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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