Avoid branching in createAttributeEventListener

Source/core/html/HTMLFrameElementBase.cpp

Index: Source/core/html/HTMLFrameElementBase.cpp
diff --git a/Source/core/html/HTMLFrameElementBase.cpp b/Source/core/html/HTMLFrameElementBase.cpp
index 05ad91ac75a8e61d7f5d14f69ff92385ad93f971..088fca8e50f44910efc54217ecfea36890779aaa 100644
--- a/Source/core/html/HTMLFrameElementBase.cpp
+++ b/Source/core/html/HTMLFrameElementBase.cpp
@@ -127,7 +127,7 @@ void HTMLFrameElementBase::parseAttribute(const QualifiedName& name, const Atomi
         // FIXME: If we are already attached, this has no effect.
     } else if (name == onbeforeunloadAttr) {
         // FIXME: should <frame> elements have beforeunload handlers?
-        setAttributeEventListener(EventTypeNames::beforeunload, createAttributeEventListener(this, name, value));
+        setAttributeEventListener(EventTypeNames::beforeunload, createAttributeEventListener(this, name, value, eventParameterName()));
     } else
         HTMLFrameOwnerElement::parseAttribute(name, value);
 }