remove shadeSpan16 from shader

src/core/SkBitmapProcState.h

 /*
  * Copyright 2007 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkBitmapProcState_DEFINED
 #define SkBitmapProcState_DEFINED
 
@@ skipping 28 matching lines @@
     typedef void (*MatrixProc)(const SkBitmapProcState&,
                                uint32_t bitmapXY[],
                                int count,
                                int x, int y);
 
     typedef void (*SampleProc32)(const SkBitmapProcState&,
                                  const uint32_t[],
                                  int count,
                                  SkPMColor colors[]);
 
-    typedef void (*SampleProc16)(const SkBitmapProcState&,
-                                 const uint32_t[],
-                                 int count,
-                                 uint16_t colors[]);
-
     typedef U16CPU (*FixedTileProc)(SkFixed);   // returns 0..0xFFFF
     typedef U16CPU (*FixedTileLowBitsProc)(SkFixed, int);   // returns 0..0xF
     typedef U16CPU (*IntTileProc)(int value, int count);   // returns 0..count-1
 
     SkPixmap            fPixmap;
     SkMatrix            fInvMatrix;         // copy of what is in fBMState, can we remove the dup?
 
     SkMatrix::MapXYProc fInvProc;           // chooseProcs
 
     SkFractionalInt     fInvSxFractionalInt;
@@ skipping 46 matching lines @@
     // are ignored
     ShaderProc32 getShaderProc32() const { return fShaderProc32; }
     ShaderProc16 getShaderProc16() const { return fShaderProc16; }
 
 #ifdef SK_DEBUG
     MatrixProc getMatrixProc() const;
 #else
     MatrixProc getMatrixProc() const { return fMatrixProc; }
 #endif
     SampleProc32 getSampleProc32() const { return fSampleProc32; }
-    SampleProc16 getSampleProc16() const { return fSampleProc16; }
 
 private:
     friend class SkBitmapProcShader;
     friend class SkLightingShaderImpl;
 
     ShaderProc32        fShaderProc32;      // chooseProcs
     ShaderProc16        fShaderProc16;      // chooseProcs
     // These are used if the shaderproc is nullptr
     MatrixProc          fMatrixProc;        // chooseProcs
     SampleProc32        fSampleProc32;      // chooseProcs
-    SampleProc16        fSampleProc16;      // chooseProcs
 
     const SkBitmapProvider fProvider;
 
     enum {
         kBMStateSize = 136  // found by inspection. if too small, we will call new/delete
     };
     SkAlignedSStorage<kBMStateSize> fBMStateStorage;
     SkBitmapController::State* fBMState;
 
     MatrixProc chooseMatrixProc(bool trivial_matrix);
@@ skipping 81 matching lines @@
     }
 
     SkFractionalInt x() const { return fX; }
     SkFractionalInt y() const { return fY; }
 
 private:
     SkFractionalInt fX, fY;
 };
 
 #endif