SVGLangSpace interface should be removed

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 217d1ae5b8d359688524ce7d796600fd1cbc0f96..8f984b9be0f11537dd31f48a8fc0c4ad654cd87c 100644
--- a/Source/core/svg/SVGPolyElement.cpp
+++ b/Source/core/svg/SVGPolyElement.cpp
@@ -75,7 +75,6 @@ bool SVGPolyElement::isSupportedAttribute(const QualifiedName& attrName)
 {
     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     if (supportedAttributes.isEmpty()) {
-        SVGLangSpace::addSupportedAttributes(supportedAttributes);
         SVGExternalResourcesRequired::addSupportedAttributes(supportedAttributes);
         supportedAttributes.add(SVGNames::pointsAttr);
     }
@@ -101,8 +100,6 @@ void SVGPolyElement::parseAttribute(const QualifiedName& name, const AtomicStrin
         return;
     }
 
-    if (SVGLangSpace::parseAttribute(name, value))
-        return;
     if (SVGExternalResourcesRequired::parseAttribute(name, value))
         return;
 
@@ -128,7 +125,7 @@ void SVGPolyElement::svgAttributeChanged(const QualifiedName& attrName)
         return;
     }
 
-    if (SVGLangSpace::isKnownAttribute(attrName) || SVGExternalResourcesRequired::isKnownAttribute(attrName)) {
+    if (SVGExternalResourcesRequired::isKnownAttribute(attrName)) {
         RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer);
         return;
     }