Do not special case null for URLUtils attributes

Source/core/html/HTMLAnchorElement.idl

Index: Source/core/html/HTMLAnchorElement.idl
diff --git a/Source/core/html/HTMLAnchorElement.idl b/Source/core/html/HTMLAnchorElement.idl
index e0c70687ad98eaa1042b8d42cc3a730207206358..6bb11f95da19a530289109377078058f3598e554 100644
--- a/Source/core/html/HTMLAnchorElement.idl
+++ b/Source/core/html/HTMLAnchorElement.idl
@@ -32,15 +32,15 @@ interface HTMLAnchorElement : HTMLElement {
     [Reflect] attribute DOMString target;
     [Reflect] attribute DOMString type;
 
-    [TreatNullAs=NullString] attribute DOMString hash;
-    [TreatNullAs=NullString] attribute DOMString host;
-    [TreatNullAs=NullString] attribute DOMString hostname;
-    [TreatNullAs=NullString] attribute DOMString pathname;
-    [TreatNullAs=NullString] attribute DOMString port;
-    [TreatNullAs=NullString] attribute DOMString protocol;
-    [TreatNullAs=NullString] attribute DOMString search;
+    attribute DOMString hash;
+    attribute DOMString host;
+    attribute DOMString hostname;
+    attribute DOMString pathname;
+    attribute DOMString port;
+    attribute DOMString protocol;
+    attribute DOMString search;
 
-    [TreatNullAs=NullString] readonly attribute DOMString origin;
+    readonly attribute DOMString origin;
 
     readonly attribute DOMString text;