Remove isSupportedAttribute in svg

Source/core/svg/SVGFEOffsetElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 31 matching lines @@
 DEFINE_TRACE(SVGFEOffsetElement)
 {
     visitor->trace(m_dx);
     visitor->trace(m_dy);
     visitor->trace(m_in1);
     SVGFilterPrimitiveStandardAttributes::trace(visitor);
 }
 
 DEFINE_NODE_FACTORY(SVGFEOffsetElement)
 
-bool SVGFEOffsetElement::isSupportedAttribute(const QualifiedName& attrName)
-{
-    DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
-    if (supportedAttributes.isEmpty()) {
-        supportedAttributes.add(SVGNames::inAttr);
-        supportedAttributes.add(SVGNames::dxAttr);
-        supportedAttributes.add(SVGNames::dyAttr);
-    }
-    return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
-}
-
 void SVGFEOffsetElement::svgAttributeChanged(const QualifiedName& attrName)
 {
-    if (!isSupportedAttribute(attrName)) {
-        SVGFilterPrimitiveStandardAttributes::svgAttributeChanged(attrName);
+    if (attrName == SVGNames::inAttr || attrName == SVGNames::dxAttr
+        || attrName == SVGNames::dyAttr) {
+        SVGElement::InvalidationGuard invalidationGuard(this);
+        invalidate();
         return;
     }
 
-    SVGElement::InvalidationGuard invalidationGuard(this);
-    invalidate();
+    SVGFilterPrimitiveStandardAttributes::svgAttributeChanged(attrName);
 }
 
 PassRefPtrWillBeRawPtr<FilterEffect> SVGFEOffsetElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
 {
     FilterEffect* input1 = filterBuilder->getEffectById(AtomicString(m_in1->currentValue()->value()));
 
     if (!input1)
         return nullptr;
 
     RefPtrWillBeRawPtr<FilterEffect> effect = FEOffset::create(filter, m_dx->currentValue()->value(), m_dy->currentValue()->value());
     effect->inputEffects().append(input1);
     return effect.release();
 }
 
 } // namespace blink