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

[Olivier Tilloy]

(and ideally the SessionStorage C++ code should be moved under src/app/webbrowser/, but that’s not strictly required for this change, so let’s keep this change for later refactoring)
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https://code.launchpad.net/~abreu-alexandre/webbrowser-app/remove-session-storage/+merge/234144
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