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

Source/core/html/MonthInputType.cpp

Index: Source/core/html/MonthInputType.cpp
diff --git a/Source/core/html/MonthInputType.cpp b/Source/core/html/MonthInputType.cpp
index c7d9d6a051a646e96965b331dd8ee07fc524c89b..cc9f3d57f21cf390af78c1b820a83bb359aa1073 100644
--- a/Source/core/html/MonthInputType.cpp
+++ b/Source/core/html/MonthInputType.cpp
@@ -55,7 +55,7 @@ static const int monthDefaultStep = 1;
 static const int monthDefaultStepBase = 0;
 static const int monthStepScaleFactor = 1;
 
-PassOwnPtr<InputType> MonthInputType::create(HTMLInputElement* element)
+PassOwnPtr<InputType> MonthInputType::create(Handle<HTMLInputElement> element)
 {
     return adoptPtr(new MonthInputType(element));
 }