Oilpan: prefer eager finalization over prefinalizers.

Source/core/dom/MutationObserver.cpp

 /*
  * 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 46 matching lines @@
 PassRefPtrWillBeRawPtr<MutationObserver> MutationObserver::create(PassOwnPtrWillBeRawPtr<MutationCallback> callback)
 {
     ASSERT(isMainThread());
     return adoptRefWillBeNoop(new MutationObserver(callback));
 }
 
 MutationObserver::MutationObserver(PassOwnPtrWillBeRawPtr<MutationCallback> callback)
     : m_callback(callback)
     , m_priority(s_observerPriority++)
 {
-#if ENABLE(OILPAN)
-    ThreadState::current()->registerPreFinalizer(*this);
-#endif
 }
 
 MutationObserver::~MutationObserver()
 {
 #if !ENABLE(OILPAN)
     ASSERT(m_registrations.isEmpty());
-    dispose();
 #endif
-}
-
-void MutationObserver::dispose()
-{
     if (!m_records.isEmpty())
         InspectorInstrumentation::didClearAllMutationRecords(m_callback->executionContext(), this);
 }
 
 void MutationObserver::observe(Node* node, const MutationObserverInit& observerInit, ExceptionState& exceptionState)
 {
     if (!node) {
         exceptionState.throwDOMException(NotFoundError, "The provided node was null.");
         return;
     }
@@ skipping 192 matching lines @@
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_callback);
     visitor->trace(m_records);
     visitor->trace(m_registrations);
     visitor->trace(m_callback);
 #endif
 }
 
 } // namespace blink