SVGLangSpace interface should be removed

Source/core/svg/SVGCircleElement.cpp

Index: Source/core/svg/SVGCircleElement.cpp
diff --git a/Source/core/svg/SVGCircleElement.cpp b/Source/core/svg/SVGCircleElement.cpp
index 6c666142222c7d21be5e6990757625edf23c8183..e1d6ba3bb6d1a1ac0571f2865341c9d0ee569e2a 100644
--- a/Source/core/svg/SVGCircleElement.cpp
+++ b/Source/core/svg/SVGCircleElement.cpp
@@ -62,7 +62,6 @@ bool SVGCircleElement::isSupportedAttribute(const QualifiedName& attrName)
 {
     DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
     if (supportedAttributes.isEmpty()) {
-        SVGLangSpace::addSupportedAttributes(supportedAttributes);
         SVGExternalResourcesRequired::addSupportedAttributes(supportedAttributes);
         supportedAttributes.add(SVGNames::cxAttr);
         supportedAttributes.add(SVGNames::cyAttr);
@@ -83,8 +82,7 @@ void SVGCircleElement::parseAttribute(const QualifiedName& name, const AtomicStr
         setCyBaseValue(SVGLength::construct(LengthModeHeight, value, parseError));
     else if (name == SVGNames::rAttr)
         setRBaseValue(SVGLength::construct(LengthModeOther, value, parseError, ForbidNegativeLengths));
-    else if (SVGLangSpace::parseAttribute(name, value)
-             || SVGExternalResourcesRequired::parseAttribute(name, value)) {
+    else if (SVGExternalResourcesRequired::parseAttribute(name, value)) {
     } else
         ASSERT_NOT_REACHED();
 
@@ -117,7 +115,7 @@ void SVGCircleElement::svgAttributeChanged(const QualifiedName& attrName)
         return;
     }
 
-    if (SVGLangSpace::isKnownAttribute(attrName) || SVGExternalResourcesRequired::isKnownAttribute(attrName)) {
+    if (SVGExternalResourcesRequired::isKnownAttribute(attrName)) {
         RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer);
         return;
     }