SVGLangSpace interface should be removed

Source/core/svg/SVGElement.h

Index: Source/core/svg/SVGElement.h
diff --git a/Source/core/svg/SVGElement.h b/Source/core/svg/SVGElement.h
index f401221e664a1d3bf44d89c23baeb434a70a0008..9098753995fb6bb546d276b884d225b00464cff2 100644
--- a/Source/core/svg/SVGElement.h
+++ b/Source/core/svg/SVGElement.h
@@ -24,7 +24,6 @@
 
 #include "core/dom/Element.h"
 #include "core/svg/SVGAnimatedString.h"
-#include "core/svg/SVGLangSpace.h"
 #include "core/svg/SVGParsingError.h"
 #include "core/svg/properties/SVGAnimatedPropertyMacros.h"
 #include "core/svg/properties/SVGPropertyInfo.h"
@@ -46,7 +45,7 @@ class SVGSVGElement;
 
 void mapAttributeToCSSProperty(HashMap<StringImpl*, CSSPropertyID>* propertyNameToIdMap, const QualifiedName& attrName);
 
-class SVGElement : public Element, public SVGLangSpace {
+class SVGElement : public Element {
 public:
     virtual ~SVGElement();
 
@@ -56,7 +55,6 @@ public:
     bool hasRelativeLengths() const { return !m_elementsWithRelativeLengths.isEmpty(); }
     virtual bool supportsMarkers() const { return false; }
     PassRefPtr<CSSValue> getPresentationAttribute(const String& name);
-    bool isKnownAttribute(const QualifiedName&);
     static bool isAnimatableCSSProperty(const QualifiedName&);
     enum CTMScope {
         NearestViewportScope, // Used by SVGGraphicsElement::getCTM()
@@ -71,6 +69,12 @@ public:
     String xmlbase() const;
     void setXMLbase(const String&);
 
+    String xmllang() const;
+    void setXMLlang(const String& xmlLang);
+
+    String xmlspace() const;
+    void setXMLspace(const String& xmlSpace);
+
     SVGSVGElement* ownerSVGElement() const;
     SVGElement* viewportElement() const;