Port convolve functions to SkOpts

src/opts/SkBitmapProcState_opts_none.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapScaler.h"
 #include "SkBitmapProcState.h"
 
 /*  A platform may optionally overwrite any of these with accelerated
     versions. On input, these will already have valid function pointers,
     so a platform need only overwrite the ones it chooses, based on the
     current state (e.g. fBitmap, fInvMatrix, etc.)
 
     fShaderProc32
     fShaderProc16
     fMatrixProc
     fSampleProc32
     fSampleProc32
  */
 
 // empty implementation just uses default supplied function pointers
 void SkBitmapProcState::platformProcs() {}
-
-// empty implementation just uses default supplied function pointers
-void SkBitmapScaler::PlatformConvolutionProcs(SkConvolutionProcs*) {}