[Merge] lp:~ahayzen/webbrowser-app/dnd-tabs-001 into lp:webbrowser-app/staging

[Olivier Tilloy]

Review: Needs Fixing

On desktop, all autopilot tests pass in wide layout, but when forcing a narrow layout, the following test reliably fails:

  webbrowser_app.tests.test_tabs.TestTabsManagement.test_last_webview_requests_close
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https://code.launchpad.net/~ahayzen/webbrowser-app/dnd-tabs-001/+merge/308507
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