Add toSVGStopElement(Node* node) to clean-up a static_cast<SVGStopElement*>

Source/core/svg/SVGStopElement.h

Index: Source/core/svg/SVGStopElement.h
diff --git a/Source/core/svg/SVGStopElement.h b/Source/core/svg/SVGStopElement.h
index a19d92830a01e9437b95aff07e220505e52c6ab0..025e57dc3acb98b5c6bb1afaff03602ceafe3286 100644
--- a/Source/core/svg/SVGStopElement.h
+++ b/Source/core/svg/SVGStopElement.h
@@ -21,6 +21,7 @@
 #ifndef SVGStopElement_h
 #define SVGStopElement_h
 
+#include "SVGNames.h"
 #include "core/svg/SVGAnimatedNumber.h"
 #include "core/svg/SVGElement.h"
 
@@ -49,6 +50,12 @@ private:
     END_DECLARE_ANIMATED_PROPERTIES
 };
 
+inline SVGStopElement* toSVGStopElement(Node* node)
+{
+    ASSERT_WITH_SECURITY_IMPLICATION(!node || node->hasTagName(SVGNames::stopTag));
+    return static_cast<SVGStopElement*>(node);
+}
+
 inline SVGStopElement* toSVGStopElement(SVGElement* element)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!element || element->isGradientStop());