Remove SVGLangSpace IDL interface

Source/core/svg/SVGDescElement.h

Index: Source/core/svg/SVGDescElement.h
diff --git a/Source/core/svg/SVGDescElement.h b/Source/core/svg/SVGDescElement.h
index 8126abb2926efd6d60a7dad86dca83181811cc77..3585247f81b974a41857cfe0489e4525f152903c 100644
--- a/Source/core/svg/SVGDescElement.h
+++ b/Source/core/svg/SVGDescElement.h
@@ -21,13 +21,11 @@
 #ifndef SVGDescElement_h
 #define SVGDescElement_h
 
-#include "core/svg/SVGLangSpace.h"
 #include "core/svg/SVGStyledElement.h"
 
 namespace WebCore {
 
-class SVGDescElement FINAL : public SVGStyledElement,
-                             public SVGLangSpace {
+class SVGDescElement FINAL : public SVGStyledElement {
 public:
     static PassRefPtr<SVGDescElement> create(const QualifiedName&, Document*);