Generate toFooElement() functions from tagname data

Source/core/svg/SVGMaskElement.h

Index: Source/core/svg/SVGMaskElement.h
diff --git a/Source/core/svg/SVGMaskElement.h b/Source/core/svg/SVGMaskElement.h
index dd4043afb52c8ee0dadcf8827f590f237e9b8eb9..2b22baa27cc034c6fb93abbda901f27d6b94964c 100644
--- a/Source/core/svg/SVGMaskElement.h
+++ b/Source/core/svg/SVGMaskElement.h
@@ -20,7 +20,6 @@
 #ifndef SVGMaskElement_h
 #define SVGMaskElement_h
 
-#include "SVGNames.h"
 #include "core/svg/SVGAnimatedBoolean.h"
 #include "core/svg/SVGAnimatedEnumeration.h"
 #include "core/svg/SVGAnimatedLength.h"
@@ -68,12 +67,6 @@ private:
     virtual void synchronizeSystemLanguage() { SVGTests::synchronizeSystemLanguage(this); }
 };
 
-inline SVGMaskElement* toSVGMaskElement(Node* node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || node->hasTagName(SVGNames::maskTag));
-    return static_cast<SVGMaskElement*>(node);
-}
-
 }
 
 #endif