bindings: Adds virtual ScriptWrappable::wrap method.

Source/core/html/HTMLUnknownElement.h

Index: Source/core/html/HTMLUnknownElement.h
diff --git a/Source/core/html/HTMLUnknownElement.h b/Source/core/html/HTMLUnknownElement.h
index d8c0e9687efdad664de3b74bc7f6fc87aa83fba9..23d15eb8e41d466c53c0ff767d2378e9862d8e22 100644
--- a/Source/core/html/HTMLUnknownElement.h
+++ b/Source/core/html/HTMLUnknownElement.h
@@ -35,6 +35,7 @@
 namespace blink {
 
 class HTMLUnknownElement FINAL : public HTMLElement {
+    DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<HTMLUnknownElement> create(const QualifiedName& tagName, Document& document)
     {
@@ -58,6 +59,6 @@ inline bool isHTMLUnknownElement(const HTMLElement& element)
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLUnknownElement);
 
-} // namespace
+} // namespace blink
 
-#endif
+#endif // HTMLUnknownElement_h