bindings: Adds virtual ScriptWrappable::wrap method.

Source/core/html/HTMLContentElement.h

Index: Source/core/html/HTMLContentElement.h
diff --git a/Source/core/html/HTMLContentElement.h b/Source/core/html/HTMLContentElement.h
index 163d3fac0c32f83930160395af6477613755c65f..d54b4b3107a63f63874114e65c6ed6dc2f8dd2f9 100644
--- a/Source/core/html/HTMLContentElement.h
+++ b/Source/core/html/HTMLContentElement.h
@@ -37,6 +37,7 @@
 namespace blink {
 
 class HTMLContentElement FINAL : public InsertionPoint {
+    DEFINE_WRAPPERTYPEINFO();
 public:
     DECLARE_NODE_FACTORY(HTMLContentElement);
     virtual ~HTMLContentElement();
@@ -89,6 +90,6 @@ inline bool HTMLContentElement::canSelectNode(const WillBeHeapVector<RawPtrWillB
     return matchSelector(siblings, nth);
 }
 
-}
+} // namespace blink
 
-#endif
+#endif // HTMLContentElement_h