Oilpan: Prepare to move IdTargetObserver and IdTargetObserverRegistry to Oilpan heap.

Source/core/dom/TreeScope.h

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 168 matching lines @@
     RawPtrWillBeMember<TreeScope> m_parentTreeScope;
 
 #if !ENABLE(OILPAN)
     int m_guardRefCount;
 #endif
 
     OwnPtr<DocumentOrderedMap> m_elementsById;
     OwnPtr<DocumentOrderedMap> m_imageMapsByName;
     OwnPtr<DocumentOrderedMap> m_labelsByForAttribute;
 
-    OwnPtr<IdTargetObserverRegistry> m_idTargetObserverRegistry;
+    OwnPtrWillBeMember<IdTargetObserverRegistry> m_idTargetObserverRegistry;
 
     mutable RefPtrWillBeMember<DOMSelection> m_selection;
 };
 
 inline bool TreeScope::hasElementWithId(StringImpl* id) const
 {
     ASSERT(id);
     return m_elementsById && m_elementsById->contains(id);
 }
 
 inline bool TreeScope::containsMultipleElementsWithId(const AtomicString& id) const
 {
     return m_elementsById && m_elementsById->containsMultiple(id.impl());
 }
 
 inline bool operator==(const TreeScope& a, const TreeScope& b) { return &a == &b; }
 inline bool operator==(const TreeScope& a, const TreeScope* b) { return &a == b; }
 inline bool operator==(const TreeScope* a, const TreeScope& b) { return a == &b; }
 inline bool operator!=(const TreeScope& a, const TreeScope& b) { return !(a == b); }
 inline bool operator!=(const TreeScope& a, const TreeScope* b) { return !(a == b); }
 inline bool operator!=(const TreeScope* a, const TreeScope& b) { return !(a == b); }
 
 HitTestResult hitTestInDocument(const Document*, int x, int y);
 TreeScope* commonTreeScope(Node*, Node*);
 
 } // namespace WebCore
 
 #endif // TreeScope_h