[Merge] lp:~rpadovani/webbrowser-app/newTabRefactoring into lp:webbrowser-app

[Riccardo Padovani]

Hi Olivier,
thanks for your review!

I addressed all your comments about UI.

But I've troubles with the TopSitesModel component - I'm sure I'm missing something very easy, but I'm not able to figure what. At the moment no sites are displayed in the top sites area, but no error are printed on the console.

Could you take a look, please?
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https://code.launchpad.net/~rpadovani/webbrowser-app/newTabRefactoring/+merge/247498
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