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

Source/core/html/ButtonInputType.cpp

Index: Source/core/html/ButtonInputType.cpp
diff --git a/Source/core/html/ButtonInputType.cpp b/Source/core/html/ButtonInputType.cpp
index 787dcaec991060b2ee53483fcfd5dde89226d0bc..f21d974f46a6f81c54391e75968506ac47783c21 100644
--- a/Source/core/html/ButtonInputType.cpp
+++ b/Source/core/html/ButtonInputType.cpp
@@ -36,7 +36,12 @@
 
 namespace WebCore {
 
-PassOwnPtr<InputType> ButtonInputType::create(HTMLInputElement* element)
+ButtonInputType::ButtonInputType(const Handle<HTMLInputElement>& element)
+    : BaseButtonInputType(element)
+{
+}
+
+PassOwnPtr<InputType> ButtonInputType::create(Handle<HTMLInputElement> element)
 {
     return adoptPtr(new ButtonInputType(element));
 }