Remove top:1px from .urlbarForm > *
Remove top:1px from .urlbarForm > *

Closes #7805

The fix is no longer necessary as the header design became flat thanks to #7546 and #7739

Auditors:

Test Plan:

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