Remove isSupportedAttribute in svg

Source/core/svg/SVGFEGaussianBlurElement.cpp

Index: Source/core/svg/SVGFEGaussianBlurElement.cpp
diff --git a/Source/core/svg/SVGFEGaussianBlurElement.cpp b/Source/core/svg/SVGFEGaussianBlurElement.cpp
index 11a9283a36b04f381401c62a74fd47d24e54a045..285077a2f542e0c02ac3e008db0586e8d1e1b782 100644
--- a/Source/core/svg/SVGFEGaussianBlurElement.cpp
+++ b/Source/core/svg/SVGFEGaussianBlurElement.cpp
@@ -54,31 +54,15 @@ void SVGFEGaussianBlurElement::setStdDeviation(float x, float y)
     invalidate();
 }
 
-bool SVGFEGaussianBlurElement::isSupportedAttribute(const QualifiedName& attrName)
-{
-    DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
-    if (supportedAttributes.isEmpty()) {
-        supportedAttributes.add(SVGNames::inAttr);
-        supportedAttributes.add(SVGNames::stdDeviationAttr);
-    }
-    return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
-}
-
 void SVGFEGaussianBlurElement::svgAttributeChanged(const QualifiedName& attrName)
 {
-    if (!isSupportedAttribute(attrName)) {
-        SVGFilterPrimitiveStandardAttributes::svgAttributeChanged(attrName);
-        return;
-    }
-
-    SVGElement::InvalidationGuard invalidationGuard(this);
-
     if (attrName == SVGNames::inAttr || attrName == SVGNames::stdDeviationAttr) {
+        SVGElement::InvalidationGuard invalidationGuard(this);
         invalidate();
         return;
     }
 
-    ASSERT_NOT_REACHED();
+    SVGFilterPrimitiveStandardAttributes::svgAttributeChanged(attrName);
 }
 
 PassRefPtrWillBeRawPtr<FilterEffect> SVGFEGaussianBlurElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)