Port convolve functions to SkOpts

src/core/SkBitmapScaler.h

Index: src/core/SkBitmapScaler.h
diff --git a/src/core/SkBitmapScaler.h b/src/core/SkBitmapScaler.h
index 3d734d6efc5a2dded5836975165941dabce10112..c96be0dbf8cc2e73e69b30ff4938e5f5ff018ce4 100644
--- a/src/core/SkBitmapScaler.h
+++ b/src/core/SkBitmapScaler.h
@@ -41,12 +41,6 @@ public:
      */
     static bool Resize(SkBitmap* result, const SkPixmap& src, ResizeMethod method,
                        int dest_width, int dest_height, SkBitmap::Allocator* = nullptr);
-
-     /** Platforms can also optionally overwrite the convolution functions
-        if we have SIMD versions of them.
-      */
-
-    static void PlatformConvolutionProcs(SkConvolutionProcs*);
 };
 
 #endif