Remove tons of OILPAN.

sky/engine/core/dom/MutationObserverInterestGroup.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 53 matching lines @@
     {
         if (!target.document().hasMutationObserversOfType(MutationObserver::Attributes))
             return nullptr;
 
         return createIfNeeded(target, MutationObserver::Attributes, MutationObserver::AttributeOldValue, &attributeName);
     }
 
     bool isOldValueRequested();
     void enqueueMutationRecord(PassRefPtr<MutationRecord>);
 
-    void trace(Visitor*);
-
 private:
     static PassOwnPtr<MutationObserverInterestGroup> createIfNeeded(Node& target, MutationObserver::MutationType, MutationRecordDeliveryOptions oldValueFlag, const QualifiedName* attributeName = 0);
     MutationObserverInterestGroup(HashMap<RawPtr<MutationObserver>, MutationRecordDeliveryOptions>& observers, MutationRecordDeliveryOptions oldValueFlag);
 
     bool hasOldValue(MutationRecordDeliveryOptions options) { return options & m_oldValueFlag; }
 
     HashMap<RawPtr<MutationObserver>, MutationRecordDeliveryOptions> m_observers;
     MutationRecordDeliveryOptions m_oldValueFlag;
 };
 
 }
 
 #endif // MutationObserverInterestGroup_h