Remove TreatNullAs=NullString for HTMLMarqueeElement

Source/core/html/HTMLMarqueeElement.idl

Index: Source/core/html/HTMLMarqueeElement.idl
diff --git a/Source/core/html/HTMLMarqueeElement.idl b/Source/core/html/HTMLMarqueeElement.idl
index cc585fcc085911b97ce0f380b280b691dee7a273..0188f6c51494890febfbd5ddf037ab44c4a4a6dd 100644
--- a/Source/core/html/HTMLMarqueeElement.idl
+++ b/Source/core/html/HTMLMarqueeElement.idl
@@ -21,17 +21,17 @@ interface HTMLMarqueeElement : HTMLElement {
     void start();
     void stop();
 
-    [Reflect, TreatNullAs=NullString] attribute DOMString behavior;
-    [Reflect, TreatNullAs=NullString] attribute DOMString bgColor;
-    [Reflect, TreatNullAs=NullString] attribute DOMString direction;
-    [Reflect, TreatNullAs=NullString] attribute DOMString height;
+    [Reflect] attribute DOMString behavior;
+    [Reflect] attribute DOMString bgColor;
+    [Reflect] attribute DOMString direction;
+    [Reflect] attribute DOMString height;
     [Reflect] attribute unsigned long hspace;
     [RaisesException=Setter] attribute long loop;
     [RaisesException=Setter] attribute long scrollAmount;
     [RaisesException=Setter] attribute long scrollDelay;
     [Reflect] attribute boolean trueSpeed;
     [Reflect] attribute unsigned long vspace;
-    [Reflect, TreatNullAs=NullString] attribute DOMString width;
+    [Reflect] attribute DOMString width;
 
     // FIXME: Implement the following event handler attributes
     // https://bugs.webkit.org/show_bug.cgi?id=49788