Remove isSupportedAttribute in svg

Source/core/svg/SVGGradientElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) Research In Motion Limited 2010. 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.
  *
@@ skipping 45 matching lines @@
 
 DEFINE_TRACE(SVGGradientElement)
 {
     visitor->trace(m_gradientTransform);
     visitor->trace(m_spreadMethod);
     visitor->trace(m_gradientUnits);
     SVGElement::trace(visitor);
     SVGURIReference::trace(visitor);
 }
 
-bool SVGGradientElement::isSupportedAttribute(const QualifiedName& attrName)
-{
-    DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
-    if (supportedAttributes.isEmpty()) {
-        SVGURIReference::addSupportedAttributes(supportedAttributes);
-        supportedAttributes.add(SVGNames::gradientUnitsAttr);
-        supportedAttributes.add(SVGNames::gradientTransformAttr);
-        supportedAttributes.add(SVGNames::spreadMethodAttr);
-    }
-    return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
-}
-
 void SVGGradientElement::svgAttributeChanged(const QualifiedName& attrName)
 {
-    if (!isSupportedAttribute(attrName)) {
-        SVGElement::svgAttributeChanged(attrName);
+    if (attrName == SVGNames::gradientUnitsAttr
+        || attrName == SVGNames::gradientTransformAttr
+        || attrName == SVGNames::spreadMethodAttr
+        || SVGURIReference::isKnownAttribute(attrName))
+    {
+        SVGElement::InvalidationGuard invalidationGuard(this);
+
+        LayoutSVGResourceContainer* renderer = toLayoutSVGResourceContainer(this->layoutObject());
+        if (renderer)
+            renderer->invalidateCacheAndMarkForLayout();
+
         return;
     }
 
-    SVGElement::InvalidationGuard invalidationGuard(this);
-
-    LayoutSVGResourceContainer* renderer = toLayoutSVGResourceContainer(this->layoutObject());
-    if (renderer)
-        renderer->invalidateCacheAndMarkForLayout();
+    SVGElement::svgAttributeChanged(attrName);
 }
 
 void SVGGradientElement::childrenChanged(const ChildrenChange& change)
 {
     SVGElement::childrenChanged(change);
 
     if (change.byParser)
         return;
 
     if (LayoutObject* object = layoutObject())
@@ skipping 11 matching lines @@
         offset = std::min(std::max(previousOffset, offset), 1.0f);
         previousOffset = offset;
 
         stops.append(Gradient::ColorStop(offset, stop->stopColorIncludingOpacity()));
     }
 
     return stops;
 }
 
 }