Replace GrExtractAlphaFragmentProcessor with DstIn compose processor

src/core/SkLightingShader.cpp

Index: src/core/SkLightingShader.cpp
diff --git a/src/core/SkLightingShader.cpp b/src/core/SkLightingShader.cpp
index 2907dba7d57f816f273c9cc8fd2694805c14aeba..dd5eb1da7746a83a384bbff545a8b8a6367f7f1d 100644
--- a/src/core/SkLightingShader.cpp
+++ b/src/core/SkLightingShader.cpp
@@ -131,7 +131,6 @@ private:
 #include "GrCoordTransform.h"
 #include "GrFragmentProcessor.h"
 #include "GrTextureAccess.h"
-#include "effects/GrExtractAlphaFragmentProcessor.h"
 #include "gl/GrGLProcessor.h"
 #include "gl/builders/GrGLProgramBuilder.h"
 #include "SkGr.h"
@@ -401,7 +400,7 @@ const GrFragmentProcessor* SkLightingShaderImpl::asFragmentProcessor(
     SkAutoTUnref<const GrFragmentProcessor> inner (
         new LightingFP(pdm, diffuseTexture, normalTexture, diffM, normM, diffParams, normParams,
                        fLights, fInvNormRotation));
-    return GrExtractAlphaFragmentProcessor::Create(inner);
+    return MulFragmentProcesorOuputByInputAlpha(inner);
 }
 
 #endif