[Merge] lp:~abreu-alexandre/webbrowser-app/remove-session-storage into lp:webbrowser-app

[Olivier Tilloy]

Review: Needs Fixing

When running the webapp_container AP tests on krillin, I’m reliably seeing a crash in /usr/bin/webapp-container. This is on krillin image #44, with packages grabbed from the last CI run in this MR.
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https://code.launchpad.net/~abreu-alexandre/webbrowser-app/remove-session-storage/+merge/234144
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