[oilpan] Completely move HTMLFormControlElement's hierarchy to the managed heap

Source/core/html/HTMLSelectElement.cpp

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * 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, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
@@ skipping 66 matching lines @@
     , m_activeSelectionEndIndex(-1)
     , m_isProcessingUserDrivenChange(false)
     , m_multiple(false)
     , m_activeSelectionState(false)
     , m_shouldRecalcListItems(false)
 {
     ASSERT(hasTagName(selectTag));
     ScriptWrappable::init(this);
 }
 
-PassRefPtr<HTMLSelectElement> HTMLSelectElement::create(const QualifiedName& tagName, Document* document, HTMLFormElement* form)
+Result<HTMLSelectElement> HTMLSelectElement::create(const QualifiedName& tagName, Document* document, HTMLFormElement* form)
 {
     ASSERT(tagName.matches(selectTag));
-    return adoptRef(new HTMLSelectElement(tagName, document, form));
+    return adoptNode(new HTMLSelectElement(tagName, document, form));
 }
 
 const AtomicString& HTMLSelectElement::formControlType() const
 {
     DEFINE_STATIC_LOCAL(const AtomicString, selectMultiple, ("select-multiple", AtomicString::ConstructFromLiteral));
     DEFINE_STATIC_LOCAL(const AtomicString, selectOne, ("select-one", AtomicString::ConstructFromLiteral));
     return m_multiple ? selectMultiple : selectOne;
 }
 
 void HTMLSelectElement::deselectItems(HTMLOptionElement* excludeElement)
@@ skipping 1458 matching lines @@
 
     const Vector<HTMLElement*>& items = listItems();
     for (unsigned i = 0; i < items.size(); ++i) {
         if (items[i]->hasTagName(optionTag))
             ++options;
     }
 
     return options;
 }
 
+void HTMLSelectElement::acceptHeapVisitor(Visitor* visitor) const
+{
+    HTMLFormControlElementWithState::acceptHeapVisitor(visitor);
+}
+
 } // namespace