Remove code to support Objective-C bindings

Source/core/page/EventSource.cpp

Index: Source/core/page/EventSource.cpp
diff --git a/Source/core/page/EventSource.cpp b/Source/core/page/EventSource.cpp
index ab444373609a1dfd9f4428f9f5d4df7d09a65559..86ea2f179bbed1f794e5f0f30673f768c1cbe9e5 100644
--- a/Source/core/page/EventSource.cpp
+++ b/Source/core/page/EventSource.cpp
@@ -415,7 +415,7 @@ void EventSource::stop()
 PassRefPtr<MessageEvent> EventSource::createMessageEvent()
 {
     RefPtr<MessageEvent> event = MessageEvent::create();
-    event->initMessageEvent(m_eventName.isEmpty() ? eventNames().messageEvent : AtomicString(m_eventName), false, false, SerializedScriptValue::create(String::adopt(m_data)), m_eventStreamOrigin, m_lastEventId, 0, 0);
+    event->initMessageEvent(m_eventName.isEmpty() ? eventNames().messageEvent : AtomicString(m_eventName), false, false, SerializedScriptValue::create(String::adopt(m_data)), m_eventStreamOrigin, m_lastEventId, 0, nullptr);
     return event.release();
 }