tree a4e3af76209407e06a8a1754716deea4c4017cad
parent 175fa8ff09049110a8509409f60cee5fd52cdbe6
author Sameer Agarwal <sameeragarwal@google.com> 1409768342 -0700
committer Sameer Agarwal <sameeragarwal@google.com> 1409788433 -0700

Remove NumericDiffFunctor.

Its API was broken, and its implementation was an unnecessary
layer of abstraction over CostFunctionToFunctor.

Change-Id: I18fc261fc6a3620b51a9eeb4dde0af03d753af69