remove colorfilter native-565 support. complicating w/ no real value.

include/effects/SkModeColorFilter.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkModeColorFilter_DEFINED
 #define SkModeColorFilter_DEFINED
 
@@ skipping 10 matching lines @@
         this->updateCache();
     };
 
     SkColor getColor() const { return fColor; }
     SkXfermode::Mode getMode() const { return fMode; }
     SkPMColor getPMColor() const { return fPMColor; }
 
     bool asColorMode(SkColor*, SkXfermode::Mode*) const SK_OVERRIDE;
     uint32_t getFlags() const SK_OVERRIDE;
     void filterSpan(const SkPMColor shader[], int count, SkPMColor result[]) const SK_OVERRIDE;
-    void filterSpan16(const uint16_t shader[], int count, uint16_t result[]) const SK_OVERRIDE;
 
 #ifndef SK_IGNORE_TO_STRING
     void toString(SkString* str) const SK_OVERRIDE {
         str->append("SkModeColorFilter: color: 0x");
         str->appendHex(fColor);
         str->append(" mode: ");
         str->append(SkXfermode::ModeName(fMode));
     }
 #endif
 
 #if SK_SUPPORT_GPU
     bool asFragmentProcessors(GrContext*, SkTDArray<GrFragmentProcessor*>*) const SK_OVERRIDE;
 #endif
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkModeColorFilter)
 
 protected:
     void flatten(SkWriteBuffer&) const SK_OVERRIDE;
 
 private:
     SkColor             fColor;
     SkXfermode::Mode    fMode;
     // cache
     SkPMColor           fPMColor;
     SkXfermodeProc      fProc;
-    SkXfermodeProc16    fProc16;
 
     void updateCache();
 
     typedef SkColorFilter INHERITED;
 };
 
 #endif