[Merge] lp:~uriboni/webbrowser-app/tabs-visual-refresh into lp:webbrowser-app

[Olivier Tilloy]

It looks like the change to debian/webbrowser-app.install is useless, the assets directory is already being installed (as a subdirectory of usr/share/webbrowser-app/webbrowser/).
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https://code.launchpad.net/~uriboni/webbrowser-app/tabs-visual-refresh/+merge/270184
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