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

Source/core/html/BaseButtonInputType.h

Index: Source/core/html/BaseButtonInputType.h
diff --git a/Source/core/html/BaseButtonInputType.h b/Source/core/html/BaseButtonInputType.h
index 154940481e830ad86ac7bd09e6a0bd0b27ab119e..e0bf5f8fd19efbcaeaa4712367f71c231775a5ca 100644
--- a/Source/core/html/BaseButtonInputType.h
+++ b/Source/core/html/BaseButtonInputType.h
@@ -38,7 +38,7 @@ namespace WebCore {
 // Base of button, file, image, reset, and submit types.
 class BaseButtonInputType : public BaseClickableWithKeyInputType {
 protected:
-    BaseButtonInputType(HTMLInputElement* element) : BaseClickableWithKeyInputType(element) { }
+    BaseButtonInputType(const Handle<HTMLInputElement>&);
 
 private:
     virtual bool shouldSaveAndRestoreFormControlState() const OVERRIDE;