Clean up toHTMLFooElement() using DEFINE_NODE_TYPE_CASTS_WITH_FUNCTION

Source/core/html/HTMLTextAreaElement.h

Index: Source/core/html/HTMLTextAreaElement.h
diff --git a/Source/core/html/HTMLTextAreaElement.h b/Source/core/html/HTMLTextAreaElement.h
index ecbdf1e12a4c14e83682c3204ae76ca92a1ae4f8..983cc01bf34f60e97c1857cf345b30a30c301b1d 100644
--- a/Source/core/html/HTMLTextAreaElement.h
+++ b/Source/core/html/HTMLTextAreaElement.h
@@ -139,11 +139,7 @@ inline bool isHTMLTextAreaElement(const Element* element)
     return element->hasTagName(HTMLNames::textareaTag);
 }
 
-inline HTMLTextAreaElement* toHTMLTextAreaElement(Node* node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || isHTMLTextAreaElement(node));
-    return static_cast<HTMLTextAreaElement*>(node);
-}
+DEFINE_NODE_TYPE_CASTS(HTMLTextAreaElement, hasTagName(HTMLNames::textareaTag));
 
 } //namespace