Remove TreatNullAs=NullString for HTMLParamElement

Source/core/html/HTMLParamElement.idl

Index: Source/core/html/HTMLParamElement.idl
diff --git a/Source/core/html/HTMLParamElement.idl b/Source/core/html/HTMLParamElement.idl
index 2de4b2020f006c867b60a1c517b1efd1fa923fe8..d832e2c3c486122c63e78a2d571a1a7da5546e19 100644
--- a/Source/core/html/HTMLParamElement.idl
+++ b/Source/core/html/HTMLParamElement.idl
@@ -18,9 +18,8 @@
  */
 
 interface HTMLParamElement : HTMLElement {
-    [Reflect, TreatNullAs=NullString] attribute DOMString name;
-    [Reflect, TreatNullAs=NullString] attribute DOMString type;
-    [Reflect, TreatNullAs=NullString] attribute DOMString value;
-    [Reflect, TreatNullAs=NullString] attribute DOMString valueType;
+    [Reflect] attribute DOMString name;
+    [Reflect] attribute DOMString type;
+    [Reflect] attribute DOMString value;
+    [Reflect] attribute DOMString valueType;
 };
-