Remove beforeunload events.

sky/engine/bindings/core/v8/V8AbstractEventListener.cpp

Index: sky/engine/bindings/core/v8/V8AbstractEventListener.cpp
diff --git a/sky/engine/bindings/core/v8/V8AbstractEventListener.cpp b/sky/engine/bindings/core/v8/V8AbstractEventListener.cpp
index e023575972d9ad133c5f9297647a47f2092534bd..2d862a0985d700fc209de6c0f705640b7abade69 100644
--- a/sky/engine/bindings/core/v8/V8AbstractEventListener.cpp
+++ b/sky/engine/bindings/core/v8/V8AbstractEventListener.cpp
@@ -37,7 +37,6 @@
 #include "bindings/core/v8/V8EventTarget.h"
 #include "bindings/core/v8/V8HiddenValue.h"
 #include "core/dom/Document.h"
-#include "core/events/BeforeUnloadEvent.h"
 #include "core/events/Event.h"
 #include "core/inspector/InspectorCounters.h"
 
@@ -141,11 +140,6 @@ void V8AbstractEventListener::invokeEventHandler(Event* event, v8::Local<v8::Val
     if (returnValue.IsEmpty())
         return;
 
-    if (m_isAttribute && !returnValue->IsNull() && !returnValue->IsUndefined() && event->isBeforeUnloadEvent()) {
-        TOSTRING_VOID(V8StringResource<>, stringReturnValue, returnValue);
-        toBeforeUnloadEvent(event)->setReturnValue(stringReturnValue);
-    }
-
     if (m_isAttribute && shouldPreventDefault(returnValue))
         event->preventDefault();
 }