[Merge] lp:~osomon/webbrowser-app/staging-fix-webapp-container-progress-bar into lp:webbrowser-app/staging

[Alexandre Abreu]

Review: Approve

LGTM, it works, thanks for that!
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https://code.launchpad.net/~osomon/webbrowser-app/staging-fix-webapp-container-progress-bar/+merge/308564
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