Remove more API from Node and ContainerNode.

sky/engine/core/dom/MutationObserverRegistration.cpp

Index: sky/engine/core/dom/MutationObserverRegistration.cpp
diff --git a/sky/engine/core/dom/MutationObserverRegistration.cpp b/sky/engine/core/dom/MutationObserverRegistration.cpp
index 5ef2799a5c5cfbbabf46cb42ae602914e931379d..c358473d89d80ee7e53619604f751058861501d6 100644
--- a/sky/engine/core/dom/MutationObserverRegistration.cpp
+++ b/sky/engine/core/dom/MutationObserverRegistration.cpp
@@ -53,9 +53,7 @@ MutationObserverRegistration::MutationObserverRegistration(MutationObserver& obs
 
 MutationObserverRegistration::~MutationObserverRegistration()
 {
-#if !ENABLE(OILPAN)
     dispose();
-#endif
 }
 
 void MutationObserverRegistration::dispose()
@@ -138,14 +136,4 @@ void MutationObserverRegistration::addRegistrationNodesToSet(HashSet<RawPtr<Node
         nodes.add(iter->get());
 }
 
-void MutationObserverRegistration::trace(Visitor* visitor)
-{
-    visitor->trace(m_observer);
-    visitor->trace(m_registrationNode);
-    visitor->trace(m_registrationNodeKeepAlive);
-#if ENABLE(OILPAN)
-    visitor->trace(m_transientRegistrationNodes);
-#endif
-}
-
 } // namespace blink