[Merge] lp:~uriboni/webbrowser-app/topsite-previews into lp:webbrowser-app

[Olivier Tilloy]

Review: Needs Fixing

webbrowser_app.tests.test_new_tab_view.TestNewTabViewContentsWide.test_remove_top_sites is failing on desktop, please fix it.
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https://code.launchpad.net/~uriboni/webbrowser-app/topsite-previews/+merge/269771
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