Revert of Implement approx-match support in image filter saveLayer() offscreen.

src/gpu/effects/GrMatrixConvolutionEffect.cpp

Index: src/gpu/effects/GrMatrixConvolutionEffect.cpp
diff --git a/src/gpu/effects/GrMatrixConvolutionEffect.cpp b/src/gpu/effects/GrMatrixConvolutionEffect.cpp
index f6b99eff8f77705af5721caf57fb9dfa31d18506..cd6d7c1f862b70e699b5c5ad8d92583602dd0731 100644
--- a/src/gpu/effects/GrMatrixConvolutionEffect.cpp
+++ b/src/gpu/effects/GrMatrixConvolutionEffect.cpp
@@ -90,7 +90,6 @@
             fDomain.sampleTexture(fsBuilder, domain, "c", coord, samplers[0]);
             if (!fConvolveAlpha) {
                 fsBuilder->codeAppend("c.rgb /= c.a;");
-                fsBuilder->codeAppend("c.rgb = clamp(c.rgb, 0, 1);");
             }
             fsBuilder->codeAppend("sum += c * k;");
         }
@@ -153,7 +152,7 @@
     fGain(SkScalarToFloat(gain)),
     fBias(SkScalarToFloat(bias) / 255.0f),
     fConvolveAlpha(convolveAlpha),
-    fDomain(GrTextureDomain::MakeTexelDomainForMode(texture, bounds, tileMode), tileMode) {
+    fDomain(GrTextureDomain::MakeTexelDomain(texture, bounds), tileMode) {
     this->initClassID<GrMatrixConvolutionEffect>();
     for (int i = 0; i < kernelSize.width() * kernelSize.height(); i++) {
         fKernel[i] = SkScalarToFloat(kernel[i]);