Change old code from "unloadListnerChanged" model to new WebKit EnableSuddenT...

third_party/WebKit/WebCore/dom/Document.cpp

Index: third_party/WebKit/WebCore/dom/Document.cpp
===================================================================
--- third_party/WebKit/WebCore/dom/Document.cpp	(revision 5109)
+++ third_party/WebKit/WebCore/dom/Document.cpp	(working copy)
@@ -2897,12 +2897,6 @@
         m_frame->eventHandler()->removePendingFrameBeforeUnloadEventCount();
 }
 
-bool Document::hasUnloadEventListener()
-{
-  return (hasWindowEventListener(eventNames().unloadEvent) || 
-          hasWindowEventListener(eventNames().beforeunloadEvent));
-}
-
 PassRefPtr<EventListener> Document::createEventListener(const String& functionName, const String& code, Node* node)
 {
     Frame* frm = frame();