[Merge] lp:~osomon/webbrowser-app/here-tos-apparmor-exception into lp:webbrowser-app

[Olivier Tilloy]

Review: Approve

Tested on krillin with the packages generated by the CI job, this fixes bug #1507667 and doesn’t seem to introduce any regressions wrt browsing the file system.
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https://code.launchpad.net/~osomon/webbrowser-app/here-tos-apparmor-exception/+merge/275069
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