2.75 -> 2.76 Vertex Paint result different

Hello,
I updated the Blender yesterday, but my model get different result.
2.76 may be right, but I want to whiten the skin without repaint vertex, how to get 2.75 result? Thanks

UPDATE SOLVED:
2.75: Materials Options - Vertex Color Paint is not checked, if checked, the result is same as 2.76
2.76: Vertex Color Paint always works, no matter checked or not checked!

2.75 and earlier:


but same file in 2.76:


node vertex color output:


The change is caused by the fix for T45737
https://developer.blender.org/T46506