Change static_cast<SVGImageElement*> with toSVGImageElement.

Source/core/svg/SVGImageElement.h

Index: Source/core/svg/SVGImageElement.h
diff --git a/Source/core/svg/SVGImageElement.h b/Source/core/svg/SVGImageElement.h
index 9dd3f421f90ce55f1177c06b77211f40ad0dea7c..9f78f4068e906afa30d08df77642a181bbedc6fb 100644
--- a/Source/core/svg/SVGImageElement.h
+++ b/Source/core/svg/SVGImageElement.h
@@ -21,6 +21,7 @@
 #ifndef SVGImageElement_h
 #define SVGImageElement_h
 
+#include "SVGNames.h"
 #include "core/svg/SVGAnimatedBoolean.h"
 #include "core/svg/SVGAnimatedLength.h"
 #include "core/svg/SVGAnimatedPreserveAspectRatio.h"
@@ -75,6 +76,12 @@ private:
     SVGImageLoader m_imageLoader;
 };
 
+inline SVGImageElement* toSVGImageElement(Node* node)
+{
+    ASSERT_WITH_SECURITY_IMPLICATION(!node || node->hasTagName(SVGNames::imageTag));
+    return static_cast<SVGImageElement*>(node);
+}
+
 } // namespace WebCore
 
 #endif