[oilpan] The Node hierarchy should have correct accept method chains

Source/core/html/HTMLTextAreaElement.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, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 504 matching lines @@
     setAttribute(rowsAttr, String::number(rows));
 }
 
 bool HTMLTextAreaElement::shouldUseInputMethod()
 {
     return true;
 }
 
 HTMLElement* HTMLTextAreaElement::placeholderElement() const
 {
-    return m_placeholder;
+    return Handle<HTMLElement>(m_placeholder).raw();
 }
 
 void HTMLTextAreaElement::attach()
 {
     HTMLTextFormControlElement::attach();
-    fixPlaceholderRenderer(m_placeholder, innerTextElement());
+    fixPlaceholderRenderer(Handle<HTMLElement>(m_placeholder).raw(), innerTextElement());
 }
 
 bool HTMLTextAreaElement::matchesReadOnlyPseudoClass() const
 {
     return isReadOnly();
 }
 
 bool HTMLTextAreaElement::matchesReadWritePseudoClass() const
 {
     return !isReadOnly();
 }
 
 void HTMLTextAreaElement::updatePlaceholderText()
 {
     String placeholderText = strippedPlaceholder();
     if (placeholderText.isEmpty()) {
         if (m_placeholder) {
-            userAgentShadowRoot()->removeChild(m_placeholder, ASSERT_NO_EXCEPTION);
-            m_placeholder = 0;
+            userAgentShadowRoot()->removeChild(Handle<HTMLElement>(m_placeholder).raw(), ASSERT_NO_EXCEPTION);
+            m_placeholder = nullptr;
         }
         return;
     }
     if (!m_placeholder) {
         Handle<HTMLDivElement> placeholder = HTMLDivElement::create(document());
-        m_placeholder = placeholder.raw();
+        m_placeholder = placeholder;
         m_placeholder->setPseudo(AtomicString("-webkit-input-placeholder", AtomicString::ConstructFromLiteral));
-        userAgentShadowRoot()->insertBefore(m_placeholder, innerTextElement()->nextSibling(), ASSERT_NO_EXCEPTION);
+        userAgentShadowRoot()->insertBefore(Handle<HTMLElement>(m_placeholder).raw(), innerTextElement()->nextSibling(), ASSERT_NO_EXCEPTION);
     }
     m_placeholder->setInnerText(placeholderText, ASSERT_NO_EXCEPTION);
-    fixPlaceholderRenderer(m_placeholder, innerTextElement());
+    fixPlaceholderRenderer(Handle<HTMLElement>(m_placeholder).raw(), innerTextElement());
 }
 
 void HTMLTextAreaElement::acceptHeapVisitor(Visitor* visitor) const
 {
+    visitor->visit(m_placeholder);
     HTMLTextFormControlElement::acceptHeapVisitor(visitor);
 }
 
 }