Require DOMWrapperWorld in event handler macros

Source/core/events/EventTarget.h

Index: Source/core/events/EventTarget.h
diff --git a/Source/core/events/EventTarget.h b/Source/core/events/EventTarget.h
index 6889bfc87ccb368b4d4de04c253683215d84b458..8d5200a779d7bc454f6d9123fb8ea49e7ce099f0 100644
--- a/Source/core/events/EventTarget.h
+++ b/Source/core/events/EventTarget.h
@@ -160,11 +160,11 @@ private:
 // macros to avoid causing so many header includes.
 #define DEFINE_ATTRIBUTE_EVENT_LISTENER(attribute) \
     EventListener* on##attribute(DOMWrapperWorld* isolatedWorld) { return getAttributeEventListener(EventTypeNames::attribute, isolatedWorld); } \
-    void setOn##attribute(PassRefPtr<EventListener> listener, DOMWrapperWorld* isolatedWorld = 0) { setAttributeEventListener(EventTypeNames::attribute, listener, isolatedWorld); } \
+    void setOn##attribute(PassRefPtr<EventListener> listener, DOMWrapperWorld* isolatedWorld) { setAttributeEventListener(EventTypeNames::attribute, listener, isolatedWorld); } \
 
 #define DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(attribute) \
     static EventListener* on##attribute(EventTarget* eventTarget, DOMWrapperWorld* isolatedWorld) { return eventTarget->getAttributeEventListener(EventTypeNames::attribute, isolatedWorld); } \
-    static void setOn##attribute(EventTarget* eventTarget, PassRefPtr<EventListener> listener, DOMWrapperWorld* isolatedWorld = 0) { eventTarget->setAttributeEventListener(EventTypeNames::attribute, listener, isolatedWorld); } \
+    static void setOn##attribute(EventTarget* eventTarget, PassRefPtr<EventListener> listener, DOMWrapperWorld* isolatedWorld) { eventTarget->setAttributeEventListener(EventTypeNames::attribute, listener, isolatedWorld); } \
 
 #define DEFINE_WINDOW_ATTRIBUTE_EVENT_LISTENER(attribute) \
     EventListener* on##attribute(DOMWrapperWorld* isolatedWorld) { return document().getWindowAttributeEventListener(EventTypeNames::attribute, isolatedWorld); } \