Remove isSupportedAttribute in svg

Source/core/svg/SVGTextPathElement.cpp

 /*
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2010 Rob Buis <rwlbuis@gmail.com>
  *
  * 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 64 matching lines @@
     visitor->trace(m_spacing);
     SVGTextContentElement::trace(visitor);
     SVGURIReference::trace(visitor);
 }
 
 void SVGTextPathElement::clearResourceReferences()
 {
     removeAllOutgoingReferences();
 }
 
-bool SVGTextPathElement::isSupportedAttribute(const QualifiedName& attrName)
-{
-    DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
-    if (supportedAttributes.isEmpty()) {
-        SVGURIReference::addSupportedAttributes(supportedAttributes);
-        supportedAttributes.add(SVGNames::startOffsetAttr);
-        supportedAttributes.add(SVGNames::methodAttr);
-        supportedAttributes.add(SVGNames::spacingAttr);
-    }
-    return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
-}
-
 void SVGTextPathElement::svgAttributeChanged(const QualifiedName& attrName)
 {
-    if (!isSupportedAttribute(attrName)) {
-        SVGTextContentElement::svgAttributeChanged(attrName);
-        return;
-    }
-
-    SVGElement::InvalidationGuard invalidationGuard(this);
-
     if (SVGURIReference::isKnownAttribute(attrName)) {
+        SVGElement::InvalidationGuard invalidationGuard(this);
         buildPendingResource();
         return;
     }
 
     if (attrName == SVGNames::startOffsetAttr)
         updateRelativeLengthsInformation();
 
-    if (LayoutObject* object = layoutObject())
-        markForLayoutAndParentResourceInvalidation(object);
+    if (attrName == SVGNames::startOffsetAttr
+        || attrName == SVGNames::methodAttr
+        || attrName == SVGNames::spacingAttr) {
+        SVGElement::InvalidationGuard invalidationGuard(this);
+        if (LayoutObject* object = layoutObject())
+            markForLayoutAndParentResourceInvalidation(object);
+
+        return;
+    }
+
+    SVGTextContentElement::svgAttributeChanged(attrName);
 }
 
 LayoutObject* SVGTextPathElement::createLayoutObject(const ComputedStyle&)
 {
     return new LayoutSVGTextPath(this);
 }
 
 bool SVGTextPathElement::layoutObjectIsNeeded(const ComputedStyle& style)
 {
     if (parentNode() && (isSVGAElement(*parentNode()) || isSVGTextElement(*parentNode())))
@@ skipping 40 matching lines @@
         clearResourceReferences();
 }
 
 bool SVGTextPathElement::selfHasRelativeLengths() const
 {
     return m_startOffset->currentValue()->isRelative()
         || SVGTextContentElement::selfHasRelativeLengths();
 }
 
 } // namespace blink