Remove isolated world parameters from event listener attributes

Source/bindings/v8/V8AbstractEventListener.cpp

Index: Source/bindings/v8/V8AbstractEventListener.cpp
diff --git a/Source/bindings/v8/V8AbstractEventListener.cpp b/Source/bindings/v8/V8AbstractEventListener.cpp
index c1505fd7c52751082bd4008b96cb35a696e07b88..93134d5f8ae0f0588fc5dfe595f204900e5bf0f2 100644
--- a/Source/bindings/v8/V8AbstractEventListener.cpp
+++ b/Source/bindings/v8/V8AbstractEventListener.cpp
@@ -179,6 +179,11 @@ v8::Local<v8::Object> V8AbstractEventListener::getReceiverObject(ExecutionContex
     return v8::Local<v8::Object>::New(isolate, v8::Handle<v8::Object>::Cast(value));
 }
 
+bool V8AbstractEventListener::belongsToTheCurrentWorld() const
+{
+    return m_isolate->InContext() && m_world == DOMWrapperWorld::current(m_isolate);
+}
+
 void V8AbstractEventListener::setWeakCallback(const v8::WeakCallbackData<v8::Object, V8AbstractEventListener> &data)
 {
     data.GetParameter()->m_listener.clear();