Fix favicon test for about:blank
Fix favicon test for about:blank

It should have an icon now

Auditors: da39a3ee5e6b4b0d3255bfef95601890afd80709@bsclifton

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