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

Source/core/dom/CheckedRadioButtons.h

Index: Source/core/dom/CheckedRadioButtons.h
diff --git a/Source/core/dom/CheckedRadioButtons.h b/Source/core/dom/CheckedRadioButtons.h
index f050faa48c16244c9745e3019072af6171f49472..73bea3a1b28be2e3d0afa3ee611f2cf42ddd3f4d 100644
--- a/Source/core/dom/CheckedRadioButtons.h
+++ b/Source/core/dom/CheckedRadioButtons.h
@@ -21,6 +21,7 @@
 #ifndef CheckedRadioButtons_h
 #define CheckedRadioButtons_h
 
+#include "heap/Handle.h"
 #include <wtf/Forward.h>
 #include <wtf/HashMap.h>
 #include <wtf/OwnPtr.h>
@@ -36,12 +37,12 @@ class CheckedRadioButtons {
 public:
     CheckedRadioButtons();
     ~CheckedRadioButtons();
-    void addButton(HTMLInputElement*);
-    void updateCheckedState(HTMLInputElement*);
-    void requiredAttributeChanged(HTMLInputElement*);
-    void removeButton(HTMLInputElement*);
-    HTMLInputElement* checkedButtonForGroup(const AtomicString& groupName) const;
-    bool isInRequiredGroup(HTMLInputElement*) const;
+    void addButton(Handle<HTMLInputElement>);
+    void updateCheckedState(Handle<HTMLInputElement>);
+    void requiredAttributeChanged(Handle<HTMLInputElement>);
+    void removeButton(Handle<HTMLInputElement>);
+    Result<HTMLInputElement> checkedButtonForGroup(const AtomicString& groupName) const;
+    bool isInRequiredGroup(Handle<HTMLInputElement>) const;
 
 private:
     typedef HashMap<AtomicStringImpl*, OwnPtr<RadioButtonGroup> > NameToGroupMap;