Remove TreatNullAs=NullString for HTMLLinkElement

Source/core/html/HTMLLinkElement.idl

Index: Source/core/html/HTMLLinkElement.idl
diff --git a/Source/core/html/HTMLLinkElement.idl b/Source/core/html/HTMLLinkElement.idl
index 6bcce34e2d40d5320dd395e91d1ec9116a365c04..73c2426ce04627a758c4303f297fcf583f3edef5 100644
--- a/Source/core/html/HTMLLinkElement.idl
+++ b/Source/core/html/HTMLLinkElement.idl
@@ -21,19 +21,18 @@
 
 interface HTMLLinkElement : HTMLElement {
     [Reflect] attribute boolean disabled;
-    [Reflect, TreatNullAs=NullString] attribute DOMString charset;
-    [Reflect, TreatNullAs=NullString, URL, PerWorldBindings, ActivityLogging=SetterForIsolatedWorlds] attribute DOMString href;
-    [Reflect, TreatNullAs=NullString] attribute DOMString hreflang;
-    [Reflect, TreatNullAs=NullString] attribute DOMString media;
-    [Reflect, TreatNullAs=NullString] attribute DOMString rel;
-    [Reflect, TreatNullAs=NullString] attribute DOMString rev;
+    [Reflect] attribute DOMString charset;
+    [Reflect, URL, PerWorldBindings, ActivityLogging=SetterForIsolatedWorlds] attribute DOMString href;
+    [Reflect] attribute DOMString hreflang;
+    [Reflect] attribute DOMString media;
+    [Reflect] attribute DOMString rel;
+    [Reflect] attribute DOMString rev;
     [PutForwards=value] readonly attribute DOMSettableTokenList sizes;
-    [Reflect, TreatNullAs=NullString] attribute DOMString target;
-    [Reflect, TreatNullAs=NullString] attribute DOMString type;
+    [Reflect] attribute DOMString target;
+    [Reflect] attribute DOMString type;
 
     // DOM Level 2 Style
     readonly attribute StyleSheet sheet;
 
     [RuntimeEnabled=HTMLImports] readonly attribute Document import;
 };
-