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

Source/core/html/HiddenInputType.h

Index: Source/core/html/HiddenInputType.h
diff --git a/Source/core/html/HiddenInputType.h b/Source/core/html/HiddenInputType.h
index d6af8c25f772b2e7280268412cb26830ada5fcbc..b9a13fc536f8cc1e276627143d816f659f47bccb 100644
--- a/Source/core/html/HiddenInputType.h
+++ b/Source/core/html/HiddenInputType.h
@@ -37,10 +37,10 @@ namespace WebCore {
 
 class HiddenInputType : public InputType {
 public:
-    static PassOwnPtr<InputType> create(HTMLInputElement*);
+    static PassOwnPtr<InputType> create(Handle<HTMLInputElement>);
 
 private:
-    HiddenInputType(HTMLInputElement* element) : InputType(element) { }
+    HiddenInputType(Handle<HTMLInputElement> element) : InputType(element) { }
     virtual const AtomicString& formControlType() const OVERRIDE;
     virtual FormControlState saveFormControlState() const OVERRIDE;
     virtual void restoreFormControlState(const FormControlState&) OVERRIDE;