Revert of Abstracted diffuse color map out of SkLightingShaderImpl into a generic SkShader

src/core/SkNormalSource.cpp

Index: src/core/SkNormalSource.cpp
diff --git a/src/core/SkNormalSource.cpp b/src/core/SkNormalSource.cpp
index 19c97f97f859af33717aa33557568c9714f6d5a8..52bb4adaa70092504a58bc4f17ecd825f6b4988a 100644
--- a/src/core/SkNormalSource.cpp
+++ b/src/core/SkNormalSource.cpp
@@ -181,6 +181,7 @@
                                                      const SkMatrix *localMatrix,
                                                      SkFilterQuality filterQuality,
                                                      SkSourceGammaTreatment gammaTreatment) const {
+
     sk_sp<GrFragmentProcessor> mapFP = fMapShader->asFragmentProcessor(context, viewM,
             localMatrix, filterQuality, gammaTreatment);