Avoid branching in createAttributeEventListener

Source/core/html/HTMLElement.cpp

Index: Source/core/html/HTMLElement.cpp
diff --git a/Source/core/html/HTMLElement.cpp b/Source/core/html/HTMLElement.cpp
index f11dc4744effdecc44fdbb18561dcb88920e488c..0ffa161f504f4a8c16e66286b3fabc45ea1ae6d2 100644
--- a/Source/core/html/HTMLElement.cpp
+++ b/Source/core/html/HTMLElement.cpp
@@ -314,7 +314,7 @@ void HTMLElement::parseAttribute(const QualifiedName& name, const AtomicString&
     } else {
         const AtomicString& eventName = eventNameForAttributeName(name);
         if (!eventName.isNull())
-            setAttributeEventListener(eventName, createAttributeEventListener(this, name, value));
+            setAttributeEventListener(eventName, createAttributeEventListener(this, name, value, eventParameterName()));
     }
 }
 
@@ -950,6 +950,12 @@ void HTMLElement::handleKeypressEvent(KeyboardEvent* event)
     }
 }
 
+const AtomicString& HTMLElement::eventParameterName()
+{
+    DEFINE_STATIC_LOCAL(const AtomicString, eventString, ("event", AtomicString::ConstructFromLiteral));
+    return eventString;
+}
+
 } // namespace WebCore
 
 #ifndef NDEBUG