Remove TreatNullAs=NullString for HTMLOutputElement

Source/core/html/HTMLOutputElement.idl

Index: Source/core/html/HTMLOutputElement.idl
diff --git a/Source/core/html/HTMLOutputElement.idl b/Source/core/html/HTMLOutputElement.idl
index caebd48f1b011ffa31aeef77e84147187f48f7a1..77eeca3bfacfe3dd2251806ab5c8ce37dee610fe 100644
--- a/Source/core/html/HTMLOutputElement.idl
+++ b/Source/core/html/HTMLOutputElement.idl
@@ -25,11 +25,11 @@
 interface HTMLOutputElement : HTMLElement {
     [PutForwards=value] readonly attribute DOMSettableTokenList htmlFor;
     readonly attribute HTMLFormElement form;
-    [Reflect, TreatNullAs=NullString] attribute DOMString name;
+    [Reflect] attribute DOMString name;
 
     readonly attribute DOMString type;
-    [TreatNullAs=NullString] attribute DOMString defaultValue;
-    [TreatNullAs=NullString] attribute DOMString value;
+    attribute DOMString defaultValue;
+    attribute DOMString value;
 
     readonly attribute boolean willValidate;
     readonly attribute ValidityState validity;