[O] org-block-background in 8.3.1?

[Luke Crook]

I'm not sure if I still need to set "org-block-background" in 8.3.1.  

But if I do need to continue setting this, what is the new name for "org-
block-background"?

(set-face-attribute 'org-block-background nil 
                    :height (round (* 0.9 (face-attribute 'fixed-pitch 
:height))))
(set-face-attribute 'org-block nil 
                    :height (round (* 0.9 (face-attribute 'fixed-pitch 
:height))))