Oilpan: move mutation observers to the Oilpan heap.

Source/core/dom/ChildListMutationScope.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 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef ChildListMutationScope_h
 #define ChildListMutationScope_h
 
 #include "core/dom/Document.h"
 #include "core/dom/MutationObserver.h"
 #include "core/dom/Node.h"
+#include "platform/heap/Handle.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
 class MutationObserverInterestGroup;
 
 // ChildListMutationAccumulator is not meant to be used directly; ChildListMutationScope is the public interface.
-class ChildListMutationAccumulator : public RefCounted<ChildListMutationAccumulator> {
+class ChildListMutationAccumulator FINAL : public RefCounted<ChildListMutationAccumulator> {
 public:
     static PassRefPtr<ChildListMutationAccumulator> getOrCreate(Node&);
     ~ChildListMutationAccumulator();
 
     void childAdded(PassRefPtr<Node>);
     void willRemoveChild(PassRefPtr<Node>);
 
     bool hasObservers() const { return m_observers; }
 
 private:
-    ChildListMutationAccumulator(PassRefPtr<Node>, PassOwnPtr<MutationObserverInterestGroup>);
+    ChildListMutationAccumulator(PassRefPtr<Node>, PassOwnPtrWillBeRawPtr<MutationObserverInterestGroup>);
 
     void enqueueMutationRecord();
     bool isEmpty();
     bool isAddedNodeInOrder(Node*);
     bool isRemovedNodeInOrder(Node*);
 
     RefPtr<Node> m_target;
 
     Vector<RefPtr<Node> > m_removedNodes;
     Vector<RefPtr<Node> > m_addedNodes;
     RefPtr<Node> m_previousSibling;
     RefPtr<Node> m_nextSibling;
     Node* m_lastAdded;
 
-    OwnPtr<MutationObserverInterestGroup> m_observers;
+    OwnPtrWillBePersistent<MutationObserverInterestGroup> m_observers;
 };
 
-class ChildListMutationScope {
+class ChildListMutationScope FINAL {
     WTF_MAKE_NONCOPYABLE(ChildListMutationScope);
+    STACK_ALLOCATED();
 public:
     explicit ChildListMutationScope(Node& target)
     {
         if (target.document().hasMutationObserversOfType(MutationObserver::ChildList))
             m_accumulator = ChildListMutationAccumulator::getOrCreate(target);
     }
 
     void childAdded(Node& child)
     {
         if (m_accumulator && m_accumulator->hasObservers())
             m_accumulator->childAdded(PassRefPtr<Node>(child));
     }
 
     void willRemoveChild(Node& child)
     {
         if (m_accumulator && m_accumulator->hasObservers())
             m_accumulator->willRemoveChild(PassRefPtr<Node>(child));
     }
 
 private:
     RefPtr<ChildListMutationAccumulator> m_accumulator;
 };
 
 } // namespace WebCore
 
 #endif // ChildListMutationScope_h