Oilpan: Make the Node hierarchy RefCountedGarbageCollected instead of TreeShared.

Source/core/html/HTMLInputElement.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, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
@@ skipping 64 matching lines @@
 #include "platform/PlatformMouseEvent.h"
 #include "platform/text/PlatformLocale.h"
 #include "wtf/MathExtras.h"
 
 using namespace std;
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
-class ListAttributeTargetObserver : IdTargetObserver {
+class ListAttributeTargetObserver : public IdTargetObserver {
     WTF_MAKE_FAST_ALLOCATED;
 public:
     static PassOwnPtr<ListAttributeTargetObserver> create(const AtomicString& id, HTMLInputElement*);
     virtual void idTargetChanged() OVERRIDE;
 
 private:
     ListAttributeTargetObserver(const AtomicString& id, HTMLInputElement*);
 
     HTMLInputElement* m_element;
 };
@@ skipping 1413 matching lines @@
     if (!dataList)
         return false;
     RefPtr<HTMLCollection> options = dataList->options();
     for (unsigned i = 0; HTMLOptionElement* option = toHTMLOptionElement(options->item(i)); ++i) {
         if (isValidValue(option->value()))
             return true;
     }
     return false;
 }
 
+void HTMLInputElement::setListAttributeTargetObserver(PassOwnPtr<ListAttributeTargetObserver> newObserver)
+{
+    if (m_listAttributeTargetObserver)
+        m_listAttributeTargetObserver->unregister();
+    m_listAttributeTargetObserver = newObserver;
+}
+
 void HTMLInputElement::resetListAttributeTargetObserver()
 {
     if (inDocument())
-        m_listAttributeTargetObserver = ListAttributeTargetObserver::create(fastGetAttribute(listAttr), this);
+        setListAttributeTargetObserver(ListAttributeTargetObserver::create(fastGetAttribute(listAttr), this));
     else
-        m_listAttributeTargetObserver = nullptr;
+        setListAttributeTargetObserver(nullptr);
 }
 
 void HTMLInputElement::listAttributeTargetChanged()
 {
     m_inputTypeView->listAttributeTargetChanged();
 }
 
 bool HTMLInputElement::isSteppable() const
 {
     return m_inputType->isSteppable();
@@ skipping 345 matching lines @@
 }
 
 #if ENABLE(INPUT_MULTIPLE_FIELDS_UI)
 PassRefPtr<RenderStyle> HTMLInputElement::customStyleForRenderer()
 {
     return m_inputTypeView->customStyleForRenderer(originalStyleForRenderer());
 }
 #endif
 
 } // namespace