We don't use boxBlurY.

src/opts/SkBlurImage_opts_SSE2.cpp

Index: src/opts/SkBlurImage_opts_SSE2.cpp
diff --git a/src/opts/SkBlurImage_opts_SSE2.cpp b/src/opts/SkBlurImage_opts_SSE2.cpp
index d2f8882726c204325c3dc5eb3a71581e3904c461..2ade91df178485e639b2419134a67071bb194bce 100644
--- a/src/opts/SkBlurImage_opts_SSE2.cpp
+++ b/src/opts/SkBlurImage_opts_SSE2.cpp
@@ -97,11 +97,9 @@ void SkBoxBlur_SSE2(const SkPMColor* src, int srcStride, SkPMColor* dst, int ker
 } // namespace
 
 bool SkBoxBlurGetPlatformProcs_SSE2(SkBoxBlurProc* boxBlurX,
-                                    SkBoxBlurProc* boxBlurY,
                                     SkBoxBlurProc* boxBlurXY,
                                     SkBoxBlurProc* boxBlurYX) {
     *boxBlurX = SkBoxBlur_SSE2<kX, kX>;
-    *boxBlurY = SkBoxBlur_SSE2<kY, kY>;
     *boxBlurXY = SkBoxBlur_SSE2<kX, kY>;
     *boxBlurYX = SkBoxBlur_SSE2<kY, kX>;
     return true;