Make SSE2/Neon convolution functions not to read extra bytes

src/opts/opts_check_x86.cpp

Index: src/opts/opts_check_x86.cpp
diff --git a/src/opts/opts_check_x86.cpp b/src/opts/opts_check_x86.cpp
index a8003a3b0e38e50ac838a18758bec6623ffd5dff..64cf0da2b76e9b9d0a2505621a6e2a1bf5c8ba6e 100644
--- a/src/opts/opts_check_x86.cpp
+++ b/src/opts/opts_check_x86.cpp
@@ -37,11 +37,9 @@
 
 void SkBitmapScaler::PlatformConvolutionProcs(SkConvolutionProcs* procs) {
     if (SkCpu::Supports(SkCpu::SSE2)) {
-        procs->fExtraHorizontalReads = 3;
         procs->fConvolveVertically = &convolveVertically_SSE2;
         procs->fConvolve4RowsHorizontally = &convolve4RowsHorizontally_SSE2;
         procs->fConvolveHorizontally = &convolveHorizontally_SSE2;
-        procs->fApplySIMDPadding = &applySIMDPadding_SSE2;
     }
 }