Port convolve functions to SkOpts

src/opts/SkBitmapProcState_opts_none.cpp

Index: src/opts/SkBitmapProcState_opts_none.cpp
diff --git a/src/opts/SkBitmapProcState_opts_none.cpp b/src/opts/SkBitmapProcState_opts_none.cpp
index f2217f3503fca5d4cf137cfcfe58fb7d0730a9bc..0d96e171336bd31032f40774fa3172ca3f2180d2 100644
--- a/src/opts/SkBitmapProcState_opts_none.cpp
+++ b/src/opts/SkBitmapProcState_opts_none.cpp
@@ -22,6 +22,3 @@
 
 // empty implementation just uses default supplied function pointers
 void SkBitmapProcState::platformProcs() {}
-
-// empty implementation just uses default supplied function pointers
-void SkBitmapScaler::PlatformConvolutionProcs(SkConvolutionProcs*) {}