Revert[2] of "switch to isABitmap, deprecate SK_SUPPORT_LEGACY_SHADERBITMAPTYPE"

src/core/SkShader.cpp

Index: src/core/SkShader.cpp
diff --git a/src/core/SkShader.cpp b/src/core/SkShader.cpp
index b3edf47dfd3c921c3abbb09bf8a533b54b7fa909..2a1c28e0cf8684ebcc57035080f12b9f5f15eb67 100644
--- a/src/core/SkShader.cpp
+++ b/src/core/SkShader.cpp
@@ -206,10 +206,6 @@ SkShader::Context::MatrixClass SkShader::Context::ComputeMatrixClass(const SkMat
 
 //////////////////////////////////////////////////////////////////////////////
 
-SkShader::BitmapType SkShader::asABitmap(SkBitmap*, SkMatrix*, TileMode*) const {
-    return kNone_BitmapType;
-}
-
 SkShader::GradientType SkShader::asAGradient(GradientInfo* info) const {
     return kNone_GradientType;
 }