Remove SVGLangSpace IDL interface

Source/core/svg/SVGSwitchElement.h

Index: Source/core/svg/SVGSwitchElement.h
diff --git a/Source/core/svg/SVGSwitchElement.h b/Source/core/svg/SVGSwitchElement.h
index a7188fb94a0c57753b8f55535ab9415f3f410f64..d20308a841c31fdafec9e62cb36f1cabf09cd70a 100644
--- a/Source/core/svg/SVGSwitchElement.h
+++ b/Source/core/svg/SVGSwitchElement.h
@@ -23,7 +23,6 @@
 
 #include "core/svg/SVGAnimatedBoolean.h"
 #include "core/svg/SVGExternalResourcesRequired.h"
-#include "core/svg/SVGLangSpace.h"
 #include "core/svg/SVGStyledTransformableElement.h"
 #include "core/svg/SVGTests.h"
 
@@ -31,7 +30,6 @@ namespace WebCore {
 
 class SVGSwitchElement FINAL : public SVGStyledTransformableElement,
                                public SVGTests,
-                               public SVGLangSpace,
                                public SVGExternalResourcesRequired {
 public:
     static PassRefPtr<SVGSwitchElement> create(const QualifiedName&, Document*);