clean up dead x86 filter opts code

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 169 matching lines @@
 void S32_alpha_D32_filter_DXDY(const SkBitmapProcState& s,
                                const uint32_t xy[], int count, SkPMColor colors[]);
 void ClampX_ClampY_filter_scale(const SkBitmapProcState& s, uint32_t xy[],
                                 int count, int x, int y);
 void ClampX_ClampY_nofilter_scale(const SkBitmapProcState& s, uint32_t xy[],
                                   int count, int x, int y);
 void ClampX_ClampY_filter_affine(const SkBitmapProcState& s,
                                  uint32_t xy[], int count, int x, int y);
 void ClampX_ClampY_nofilter_affine(const SkBitmapProcState& s,
                                    uint32_t xy[], int count, int x, int y);
-void S32_D16_filter_DX(const SkBitmapProcState& s,
-                       const uint32_t* xy, int count, uint16_t* colors);
-void S32_D16_filter_DXDY(const SkBitmapProcState& s,
-                         const uint32_t* xy, int count, uint16_t* colors);
 
 // Helper class for mapping the middle of pixel (x, y) into SkFractionalInt bitmap space.
 // TODO: filtered version which applies a fFilterOne{X,Y}/2 bias instead of epsilon?
 class SkBitmapProcStateAutoMapper {
 public:
     SkBitmapProcStateAutoMapper(const SkBitmapProcState& s, int x, int y) {
         SkPoint pt;
         s.fInvProc(s.fInvMatrix,
                    SkIntToScalar(x) + SK_ScalarHalf,
                    SkIntToScalar(y) + SK_ScalarHalf, &pt);
@@ skipping 12 matching lines @@
     }
 
     SkFractionalInt x() const { return fX; }
     SkFractionalInt y() const { return fY; }
 
 private:
     SkFractionalInt fX, fY;
 };
 
 #endif