Remove tons of OILPAN.

sky/engine/core/events/FocusEvent.cpp

Index: sky/engine/core/events/FocusEvent.cpp
diff --git a/sky/engine/core/events/FocusEvent.cpp b/sky/engine/core/events/FocusEvent.cpp
index fcc419b784804986fb98ee74b706314148df9b83..050986b2d8aec4bb2a9b626e82049bb501f004a1 100644
--- a/sky/engine/core/events/FocusEvent.cpp
+++ b/sky/engine/core/events/FocusEvent.cpp
@@ -62,12 +62,6 @@ FocusEvent::FocusEvent(const AtomicString& type, const FocusEventInit& initializ
 {
 }
 
-void FocusEvent::trace(Visitor* visitor)
-{
-    visitor->trace(m_relatedTarget);
-    UIEvent::trace(visitor);
-}
-
 PassRefPtr<FocusEventDispatchMediator> FocusEventDispatchMediator::create(PassRefPtr<FocusEvent> focusEvent)
 {
     return adoptRef(new FocusEventDispatchMediator(focusEvent));