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

Source/core/html/HTMLTextAreaElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
@@ skipping 15 matching lines @@
 
 #include "core/html/HTMLTextFormControlElement.h"
 
 namespace WebCore {
 
 class BeforeTextInsertedEvent;
 class VisibleSelection;
 
 class HTMLTextAreaElement : public HTMLTextFormControlElement {
 public:
-    static PassRefPtr<HTMLTextAreaElement> create(const QualifiedName&, Document*, HTMLFormElement*);
+    static Result<HTMLTextAreaElement> create(const QualifiedName&, Document*, HTMLFormElement*);
 
     int cols() const { return m_cols; }
     int rows() const { return m_rows; }
 
     bool shouldWrapText() const { return m_wrap != NoWrap; }
 
     virtual String value() const;
     void setValue(const String&);
     String defaultValue() const;
     void setDefaultValue(const String&);
     int textLength() const { return value().length(); }
     virtual int maxLength() const;
     void setMaxLength(int, ExceptionCode&);
     // For ValidityState
     virtual String validationMessage() const OVERRIDE;
     virtual bool valueMissing() const OVERRIDE;
     virtual bool tooLong() const OVERRIDE;
     bool isValidValue(const String&) const;
     
     virtual HTMLElement* innerTextElement() const;
 
     void rendererWillBeDestroyed();
 
     void setCols(int);
     void setRows(int);
 
+    virtual void acceptHeapVisitor(Visitor*) const OVERRIDE;
+
 private:
     HTMLTextAreaElement(const QualifiedName&, Document*, HTMLFormElement*);
 
     enum WrapMethod { NoWrap, SoftWrap, HardWrap };
 
     virtual void didAddUserAgentShadowRoot(ShadowRoot*) OVERRIDE;
     virtual bool areAuthorShadowsAllowed() const OVERRIDE { return false; }
 
     void handleBeforeTextInsertedEvent(BeforeTextInsertedEvent*) const;
     static String sanitizeUserInputValue(const String&, unsigned maxLength);
@@ skipping 55 matching lines @@
 };
 
 inline bool isHTMLTextAreaElement(Node* node)
 {
     return node->hasTagName(HTMLNames::textareaTag);
 }
 
 } //namespace
 
 #endif