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

Source/core/accessibility/AccessibilityListBoxOption.cpp

Index: Source/core/accessibility/AccessibilityListBoxOption.cpp
diff --git a/Source/core/accessibility/AccessibilityListBoxOption.cpp b/Source/core/accessibility/AccessibilityListBoxOption.cpp
index dd3dbe98f9fb67857c66605887c8521da3b740a6..1df83d0359569a7fe06f009ff28683b9c14fb745 100644
--- a/Source/core/accessibility/AccessibilityListBoxOption.cpp
+++ b/Source/core/accessibility/AccessibilityListBoxOption.cpp
@@ -85,7 +85,7 @@ bool AccessibilityListBoxOption::isSelected() const
 
 bool AccessibilityListBoxOption::isSelectedOptionActive() const
 {
-    HTMLSelectElement* listBoxParentNode = listBoxOptionParentNode();
+    Handle<HTMLSelectElement> listBoxParentNode = listBoxOptionParentNode();
     if (!listBoxParentNode)
         return false;
 
@@ -98,7 +98,7 @@ LayoutRect AccessibilityListBoxOption::elementRect() const
     if (!m_optionElement)
         return rect;
     
-    HTMLSelectElement* listBoxParentNode = listBoxOptionParentNode();
+    Handle<HTMLSelectElement> listBoxParentNode = listBoxOptionParentNode();
     if (!listBoxParentNode)
         return rect;
     
@@ -136,7 +136,7 @@ bool AccessibilityListBoxOption::canSetSelectedAttribute() const
     if (m_optionElement->isDisabledFormControl())
         return false;
     
-    HTMLSelectElement* selectElement = listBoxOptionParentNode();
+    Handle<HTMLSelectElement> selectElement = listBoxOptionParentNode();
     if (selectElement && selectElement->isDisabledFormControl())
         return false;
     
@@ -168,16 +168,16 @@ Element* AccessibilityListBoxOption::actionElement() const
 
 AccessibilityObject* AccessibilityListBoxOption::parentObject() const
 {
-    HTMLSelectElement* parentNode = listBoxOptionParentNode();
+    Handle<HTMLSelectElement> parentNode = listBoxOptionParentNode();
     if (!parentNode)
         return 0;
     
-    return m_optionElement->document()->axObjectCache()->getOrCreate(parentNode);
+    return m_optionElement->document()->axObjectCache()->getOrCreate(parentNode.raw());
 }
 
 void AccessibilityListBoxOption::setSelected(bool selected)
 {
-    HTMLSelectElement* selectElement = listBoxOptionParentNode();
+    Handle<HTMLSelectElement> selectElement = listBoxOptionParentNode();
     if (!selectElement)
         return;
     
@@ -193,10 +193,10 @@ void AccessibilityListBoxOption::setSelected(bool selected)
     selectElement->accessKeySetSelectedIndex(optionIndex);
 }
 
-HTMLSelectElement* AccessibilityListBoxOption::listBoxOptionParentNode() const
+Result<HTMLSelectElement> AccessibilityListBoxOption::listBoxOptionParentNode() const
 {
     if (!m_optionElement)
-        return 0;
+        return nullptr;
     
     if (m_optionElement->hasTagName(optionTag))
         return static_cast<HTMLOptionElement*>(m_optionElement)->ownerSelectElement();
@@ -204,7 +204,7 @@ HTMLSelectElement* AccessibilityListBoxOption::listBoxOptionParentNode() const
     if (m_optionElement->hasTagName(optgroupTag))
         return static_cast<HTMLOptGroupElement*>(m_optionElement)->ownerSelectElement();
     
-    return 0;
+    return nullptr;
 }
 
 int AccessibilityListBoxOption::listBoxOptionIndex() const
@@ -212,7 +212,7 @@ int AccessibilityListBoxOption::listBoxOptionIndex() const
     if (!m_optionElement)
         return -1;
     
-    HTMLSelectElement* selectElement = listBoxOptionParentNode();
+    Handle<HTMLSelectElement> selectElement = listBoxOptionParentNode();
     if (!selectElement) 
         return -1;