We don't use boxBlurY.

src/opts/SkBlurImage_opts_arm.cpp

 /*
  * Copyright 2014 ARM Ltd.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBlurImage_opts_neon.h"
 #include "SkUtilsArm.h"
 
 bool SkBoxBlurGetPlatformProcs(SkBoxBlurProc* boxBlurX,
-                               SkBoxBlurProc* boxBlurY,
                                SkBoxBlurProc* boxBlurXY,
                                SkBoxBlurProc* boxBlurYX) {
 #if SK_ARM_NEON_IS_NONE
     return false;
 #else
 #if SK_ARM_NEON_IS_DYNAMIC
     if (!sk_cpu_arm_has_neon()) {
         return false;
     }
 #endif
-    return SkBoxBlurGetPlatformProcs_NEON(boxBlurX, boxBlurY, boxBlurXY, boxBlurYX);
+    return SkBoxBlurGetPlatformProcs_NEON(boxBlurX, boxBlurXY, boxBlurYX);
 #endif
 }