Remove isSupportedAttribute in svg

Source/core/svg/SVGPolyElement.cpp

Index: Source/core/svg/SVGPolyElement.cpp
diff --git a/Source/core/svg/SVGPolyElement.cpp b/Source/core/svg/SVGPolyElement.cpp
index daed4b76b93495a0a0609dd77b361d063127a49f..e592d4e54edd1f3aa6895b92b9ad6b18b05080a8 100644
--- a/Source/core/svg/SVGPolyElement.cpp
+++ b/Source/core/svg/SVGPolyElement.cpp
@@ -42,19 +42,19 @@ DEFINE_TRACE(SVGPolyElement)
 
 void SVGPolyElement::svgAttributeChanged(const QualifiedName& attrName)
 {
-    if (attrName != SVGNames::pointsAttr) {
-        SVGGeometryElement::svgAttributeChanged(attrName);
-        return;
-    }
+    if (attrName == SVGNames::pointsAttr) {
+        SVGElement::InvalidationGuard invalidationGuard(this);
 
-    SVGElement::InvalidationGuard invalidationGuard(this);
+        LayoutSVGShape* renderer = toLayoutSVGShape(this->layoutObject());
+        if (!renderer)
+            return;
 
-    LayoutSVGShape* renderer = toLayoutSVGShape(this->layoutObject());
-    if (!renderer)
+        renderer->setNeedsShapeUpdate();
+        markForLayoutAndParentResourceInvalidation(renderer);
         return;
+    }
 
-    renderer->setNeedsShapeUpdate();
-    markForLayoutAndParentResourceInvalidation(renderer);
+    SVGGeometryElement::svgAttributeChanged(attrName);
 }
 
 }