Refactor bitmap scaler to make it easier to migrate rest of chrome to use it

src/core/SkBitmapProcState.cpp

Index: src/core/SkBitmapProcState.cpp
diff --git a/src/core/SkBitmapProcState.cpp b/src/core/SkBitmapProcState.cpp
index f6f9f3fa06c20c025993f47ab2d071843ea7fb2f..48962cffa46c173b98f3c48fe0ffbf26720c9aab 100644
--- a/src/core/SkBitmapProcState.cpp
+++ b/src/core/SkBitmapProcState.cpp
@@ -172,16 +172,11 @@ bool SkBitmapProcState::possiblyScaleImage() {
 
             // All the criteria are met; let's make a new bitmap.
 
-            SkConvolutionProcs simd;
-            sk_bzero(&simd, sizeof(simd));
-            this->platformConvolutionProcs(&simd);
-
             if (!SkBitmapScaler::Resize(&fScaledBitmap,
                                         fOrigBitmap,
                                         SkBitmapScaler::RESIZE_BEST,
                                         dest_width,
                                         dest_height,
-                                        simd,
                                         SkScaledImageCache::GetAllocator())) {
                 // we failed to create fScaledBitmap, so just return and let
                 // the scanline proc handle it.