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

[Alexandre Abreu]

I updated the TEstPlan to account for those uri-handler tests:

https://wiki.ubuntu.com/Process/Merges/TestPlan/webapp-container

I will update the MR though with tests for that since the matrix of tests is not getting simpler to cover all the cases, it'll be better if automated
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https://code.launchpad.net/~abreu-alexandre/webbrowser-app/fix-url-updates-for-manifest-webapps/+merge/276413
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