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

Source/core/html/FormAssociatedElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 18 matching lines @@
 #include "core/dom/IdTargetObserver.h"
 #include "core/html/HTMLFormControlElement.h"
 #include "core/html/HTMLFormElement.h"
 #include "core/html/HTMLObjectElement.h"
 #include "core/html/ValidityState.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
-// FIXME: Oilpan: IdTargetObserver should be on-heap.
-class FormAttributeTargetObserver : public NoBaseWillBeGarbageCollectedFinalized<FormAttributeTargetObserver>, public IdTargetObserver {
+class FormAttributeTargetObserver : public IdTargetObserver {
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
     static PassOwnPtrWillBeRawPtr<FormAttributeTargetObserver> create(const AtomicString& id, FormAssociatedElement*);
-    void trace(Visitor* visitor) { visitor->trace(m_element); }
+    virtual void trace(Visitor*) OVERRIDE;
     virtual void idTargetChanged() OVERRIDE;
 
 private:
     FormAttributeTargetObserver(const AtomicString& id, FormAssociatedElement*);
 
     RawPtrWillBeMember<FormAssociatedElement> m_element;
 };
 
 FormAssociatedElement::FormAssociatedElement()
     : m_formWasSetByParser(false)
@@ skipping 276 matching lines @@
 {
     return adoptPtrWillBeNoop(new FormAttributeTargetObserver(id, element));
 }
 
 FormAttributeTargetObserver::FormAttributeTargetObserver(const AtomicString& id, FormAssociatedElement* element)
     : IdTargetObserver(toHTMLElement(element)->treeScope().idTargetObserverRegistry(), id)
     , m_element(element)
 {
 }
 
+void FormAttributeTargetObserver::trace(Visitor* visitor)
+{
+    visitor->trace(m_element);
+    IdTargetObserver::trace(visitor);
+}
+
 void FormAttributeTargetObserver::idTargetChanged()
 {
     m_element->formAttributeTargetChanged();
 }
 
 } // namespace Webcore