[Merge] lp:~sbaldassin/webbrowser-app/testability into lp:webbrowser-app

[Olivier Tilloy]

FTR, the new interface in snapd is being proposed at https://github.com/snapcore/snapd/pull/2714.
Let’s wait until it lands to land this.

One minor nitpick: would you mind fixing the indentation below "testability:" for the sake of consistency (2 spaces used).
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https://code.launchpad.net/~sbaldassin/webbrowser-app/testability/+merge/315469
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~sbaldassin/webbrowser-app/testability into lp:webbrowser-app.