Oilpan: move mutation observers to the Oilpan heap.

Source/core/dom/Node.h

Index: Source/core/dom/Node.h
diff --git a/Source/core/dom/Node.h b/Source/core/dom/Node.h
index 04c2a801fdf4c899b3ce949eff900076c7fa8915..7a2bba0b46bee01049d06587355c085e77184e42 100644
--- a/Source/core/dom/Node.h
+++ b/Source/core/dom/Node.h
@@ -36,6 +36,7 @@
 #include "core/inspector/InspectorCounters.h"
 #include "core/rendering/style/RenderStyleConstants.h"
 #include "platform/geometry/LayoutRect.h"
+#include "platform/heap/Handle.h"
 #include "platform/weborigin/KURLHash.h"
 #include "wtf/Forward.h"
 #include "wtf/ListHashSet.h"
@@ -647,7 +648,7 @@ public:
     virtual EventTargetData* eventTargetData() OVERRIDE;
     virtual EventTargetData& ensureEventTargetData() OVERRIDE;
 
-    void getRegisteredMutationObserversOfType(HashMap<MutationObserver*, MutationRecordDeliveryOptions>&, MutationObserver::MutationType, const QualifiedName* attributeName);
+    void getRegisteredMutationObserversOfType(WillBeHeapHashMap<RawPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions>&, MutationObserver::MutationType, const QualifiedName* attributeName);
     void registerMutationObserver(MutationObserver&, MutationObserverOptions, const HashSet<AtomicString>& attributeFilter);
     void unregisterMutationObserver(MutationObserverRegistration*);
     void registerTransientMutationObserver(MutationObserverRegistration*);
@@ -820,8 +821,8 @@ private:
 
     void trackForDebugging();
 
-    Vector<OwnPtr<MutationObserverRegistration> >* mutationObserverRegistry();
-    HashSet<MutationObserverRegistration*>* transientMutationObserverRegistry();
+    WillBeHeapVector<OwnPtrWillBeMember<MutationObserverRegistration> >* mutationObserverRegistry();
+    WillBeHeapHashSet<RawPtrWillBeMember<MutationObserverRegistration> >* transientMutationObserverRegistry();
 
     mutable uint32_t m_nodeFlags;
     ContainerNode* m_parentOrShadowHostNode;