Remove SVGLangSpace IDL interface

Source/core/svg/SVGElement.cpp

Index: Source/core/svg/SVGElement.cpp
diff --git a/Source/core/svg/SVGElement.cpp b/Source/core/svg/SVGElement.cpp
index f9359c98b8b7c6bd6e9ab9cda990591b52535729..d5178e594a5bfebca2dd2587f9c84010c630d2d2 100644
--- a/Source/core/svg/SVGElement.cpp
+++ b/Source/core/svg/SVGElement.cpp
@@ -334,7 +334,8 @@ void SVGElement::parseAttribute(const QualifiedName& name, const AtomicString& v
         setAttributeEventListener(eventNames().focusoutEvent, createAttributeEventListener(this, name, value));
     else if (name == SVGNames::onactivateAttr)
         setAttributeEventListener(eventNames().DOMActivateEvent, createAttributeEventListener(this, name, value));
-    else
+    else if (SVGLangSpace::parseAttribute(name, value)) {
+    } else
         Element::parseAttribute(name, value);
 }