Created by: lipis
The difference is 0.5% darkness since the old value was darken(@navbar-default-bg, 7%) and the value of @navbar-default-border is darken(@navbar-default-bg, 6.5%)
I hit on this one when I tried to change the color of the navbar-default-bg to transparent and after I fixed all the related ones in the variables.less there was a problem in the navbar.less.