remove imagefilter::sizeconstraint

src/effects/SkBlurMaskFilter.cpp

Index: src/effects/SkBlurMaskFilter.cpp
diff --git a/src/effects/SkBlurMaskFilter.cpp b/src/effects/SkBlurMaskFilter.cpp
index a4dd70270be22fb58d690cecaaf73960119b1a0f..ca448bc2d0cbf110354c45d3bf9e7a47b344ff52 100644
--- a/src/effects/SkBlurMaskFilter.cpp
+++ b/src/effects/SkBlurMaskFilter.cpp
@@ -1241,8 +1241,7 @@ bool SkBlurMaskFilterImpl::filterMaskGPU(GrTexture* src,
     // gaussianBlur.  Otherwise, we need to save it for later compositing.
     bool isNormalBlur = (kNormal_SkBlurStyle == fBlurStyle);
     *result = SkGpuBlurUtils::GaussianBlur(context, src, isNormalBlur && canOverwriteSrc,
-                                           clipRect, nullptr, xformedSigma, xformedSigma,
-                                           GrTextureProvider::kApprox_SizeConstraint);
+                                           clipRect, nullptr, xformedSigma, xformedSigma);
     if (nullptr == *result) {
         return false;
     }