Remove isSupportedAttribute in svg

Source/core/svg/SVGFEDropShadowElement.cpp

 /*
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 42 matching lines @@
 
 DEFINE_NODE_FACTORY(SVGFEDropShadowElement)
 
 void SVGFEDropShadowElement::setStdDeviation(float x, float y)
 {
     stdDeviationX()->baseValue()->setValue(x);
     stdDeviationY()->baseValue()->setValue(y);
     invalidate();
 }
 
-bool SVGFEDropShadowElement::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);
-        supportedAttributes.add(SVGNames::stdDeviationAttr);
-    }
-    return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
-}
-
 void SVGFEDropShadowElement::svgAttributeChanged(const QualifiedName& attrName)
 {
-    if (!isSupportedAttribute(attrName)) {
-        SVGFilterPrimitiveStandardAttributes::svgAttributeChanged(attrName);
-        return;
-    }
-
-    SVGElement::InvalidationGuard invalidationGuard(this);
-
     if (attrName == SVGNames::inAttr
         || attrName == SVGNames::stdDeviationAttr
         || attrName == SVGNames::dxAttr
         || attrName == SVGNames::dyAttr) {
+        SVGElement::InvalidationGuard invalidationGuard(this);
         invalidate();
         return;
     }
 
-    ASSERT_NOT_REACHED();
+    SVGFilterPrimitiveStandardAttributes::svgAttributeChanged(attrName);
 }
 
 PassRefPtrWillBeRawPtr<FilterEffect> SVGFEDropShadowElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
 {
     LayoutObject* renderer = this->layoutObject();
     if (!renderer)
         return nullptr;
 
     if (stdDeviationX()->currentValue()->value() < 0 || stdDeviationY()->currentValue()->value() < 0)
         return nullptr;
 
     ASSERT(renderer->style());
     const SVGComputedStyle& svgStyle = renderer->style()->svgStyle();
 
     Color color = svgStyle.floodColor();
     float opacity = svgStyle.floodOpacity();
 
     FilterEffect* input1 = filterBuilder->getEffectById(AtomicString(m_in1->currentValue()->value()));
     if (!input1)
         return nullptr;
 
     RefPtrWillBeRawPtr<FilterEffect> effect = FEDropShadow::create(filter, stdDeviationX()->currentValue()->value(), stdDeviationY()->currentValue()->value(), m_dx->currentValue()->value(), m_dy->currentValue()->value(), color, opacity);
     effect->inputEffects().append(input1);
     return effect.release();
 }
 
 } // namespace blink