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

Source/core/rendering/RenderMenuList.cpp

Index: Source/core/rendering/RenderMenuList.cpp
diff --git a/Source/core/rendering/RenderMenuList.cpp b/Source/core/rendering/RenderMenuList.cpp
index 03b69e73f899e4f3a9628bd35470d968f7ab65e8..b7830ddb73a471f707b1493205d5f90fbc21e1d0 100644
--- a/Source/core/rendering/RenderMenuList.cpp
+++ b/Source/core/rendering/RenderMenuList.cpp
@@ -131,7 +131,7 @@ void RenderMenuList::adjustInnerStyle()
     }
 }
 
-inline HTMLSelectElement* RenderMenuList::selectElement() const
+inline Result<HTMLSelectElement> RenderMenuList::selectElement() const
 {
     return toHTMLSelectElement(node());
 }
@@ -219,7 +219,7 @@ void RenderMenuList::updateFromElement()
 
 void RenderMenuList::setTextFromOption(int optionIndex)
 {
-    HTMLSelectElement* select = selectElement();
+    Handle<HTMLSelectElement> select = selectElement();
     const Vector<HTMLElement*>& listItems = select->listItems();
     int size = listItems.size();
 
@@ -339,7 +339,7 @@ void RenderMenuList::showPopup()
     FloatPoint absTopLeft = localToAbsolute(FloatPoint(), UseTransforms);
     IntRect absBounds = absoluteBoundingBoxRectIgnoringTransforms();
     absBounds.setLocation(roundedIntPoint(absTopLeft));
-    HTMLSelectElement* select = selectElement();
+    Handle<HTMLSelectElement> select = selectElement();
     m_popup->show(absBounds, document()->view(), select->optionToListIndex(select->selectedIndex()));
 }
 
@@ -357,7 +357,7 @@ void RenderMenuList::valueChanged(unsigned listIndex, bool fireOnChange)
     if (!doc || doc != doc->frame()->document())
         return;
     
-    HTMLSelectElement* select = selectElement();
+    Handle<HTMLSelectElement> select = selectElement();
     select->optionSelectedByUser(select->listToOptionIndex(listIndex), fireOnChange);
 }
 
@@ -385,7 +385,7 @@ void RenderMenuList::didUpdateActiveOption(int optionIndex)
         return;
     m_lastActiveIndex = optionIndex;
 
-    HTMLSelectElement* select = selectElement();
+    Handle<HTMLSelectElement> select = selectElement();
     int listIndex = select->optionToListIndex(optionIndex);
     if (listIndex < 0 || listIndex >= static_cast<int>(select->listItems().size()))
         return;
@@ -398,7 +398,7 @@ void RenderMenuList::didUpdateActiveOption(int optionIndex)
 
 String RenderMenuList::itemText(unsigned listIndex) const
 {
-    HTMLSelectElement* select = selectElement();
+    Handle<HTMLSelectElement> select = selectElement();
     const Vector<HTMLElement*>& listItems = select->listItems();
     if (listIndex >= listItems.size())
         return String();
@@ -578,7 +578,7 @@ int RenderMenuList::listSize() const
 
 int RenderMenuList::selectedIndex() const
 {
-    HTMLSelectElement* select = selectElement();
+    Handle<HTMLSelectElement> select = selectElement();
     return select->optionToListIndex(select->selectedIndex());
 }