[Merge] lp:~abreu-alexandre/webbrowser-app/fix-url-updates-for-manifest-webapps into lp:webbrowser-app

[Olivier Tilloy]

I’m not familiar with this code, and I’m not sure how to verify that it actually fixes the bug, but at least the autopilot tests all pass on my desktop.
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https://code.launchpad.net/~abreu-alexandre/webbrowser-app/fix-url-updates-for-manifest-webapps/+merge/276413
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