Add test for after unpinning tab Auditors: @bbondy, @bsclifton
Add test for after unpinning tab
Auditors: 3b7c71ee0e5cc446e346f75e333ddae4d394475d@bsclifton

diasdavid/browser-laptop,diasdavid/browser-laptop,timborden/browser-laptop,timborden/browser-laptop,luixxiul/browser-laptop,timborden/browser-laptop,luixxiul/browser-laptop,luixxiul/browser-laptop,diasdavid/browser-laptop,timborden/browser-laptop,diasdavid/browser-laptop,luixxiul/browser-laptop