Generate toFooElement() functions from tagname data

Source/core/html/HTMLAreaElement.h

Index: Source/core/html/HTMLAreaElement.h
diff --git a/Source/core/html/HTMLAreaElement.h b/Source/core/html/HTMLAreaElement.h
index 2fc4cebc81c034999b49ce163a815732cb391de0..65f62ad6d7d3b6b0d2f8293f7dfd4846e3afffd0 100644
--- a/Source/core/html/HTMLAreaElement.h
+++ b/Source/core/html/HTMLAreaElement.h
@@ -78,12 +78,6 @@ inline bool isHTMLAreaElement(const Element* element)
     return element->hasTagName(HTMLNames::areaTag);
 }
 
-inline HTMLAreaElement* toHTMLAreaElement(Node* node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || isHTMLAreaElement(node));
-    return static_cast<HTMLAreaElement*>(node);
-}
-
 } //namespace
 
 #endif