[Merge] lp:~uriboni/webbrowser-app/new-tab-wide-format into lp:webbrowser-app

[Olivier Tilloy]

Review: Needs Fixing

Still seeing 3 autopilot failures on desktop:

webbrowser_app.tests.test_bookmark_options.TestBookmarkOptions.test_save_bookmarked_url_in_existing_folder
webbrowser_app.tests.test_new_tab_view.TestNewTabViewContentsWide.test_remove_top_sites
webbrowser_app.tests.test_private.TestPrivateView.test_url_showing_in_top_sites_in_and_out_private_mode
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https://code.launchpad.net/~uriboni/webbrowser-app/new-tab-wide-format/+merge/266382
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