Remove TreatNullAs=NullString for HTMLEmbedElement

Source/core/html/HTMLEmbedElement.idl

Index: Source/core/html/HTMLEmbedElement.idl
diff --git a/Source/core/html/HTMLEmbedElement.idl b/Source/core/html/HTMLEmbedElement.idl
index 36a6090e5eec2ac0a689e95fd121dcc6d722a287..aad4db371f476f7403bdb03b240b5f029e718e0d 100644
--- a/Source/core/html/HTMLEmbedElement.idl
+++ b/Source/core/html/HTMLEmbedElement.idl
@@ -21,17 +21,16 @@
 [
     CustomLegacyCall,
 ] interface HTMLEmbedElement : HTMLElement {
-[Reflect, TreatNullAs=NullString] attribute DOMString align;
-[Reflect, TreatNullAs=NullString] attribute DOMString height;
-[Reflect, TreatNullAs=NullString] attribute DOMString name;
-[Reflect, TreatNullAs=NullString, URL, PerWorldBindings, ActivityLogging=SetterForIsolatedWorlds] attribute DOMString src;
-[Reflect, TreatNullAs=NullString] attribute DOMString type;
-[Reflect, TreatNullAs=NullString] attribute DOMString width;
-[Custom, NotEnumerable] getter boolean (unsigned long index);
-[Custom] setter boolean (unsigned long index, Node value);
-[Custom, NotEnumerable] getter Node (DOMString name);
-[Custom] setter Node (DOMString name, Node value);
+    [Reflect] attribute DOMString align;
+    [Reflect] attribute DOMString height;
+    [Reflect] attribute DOMString name;
+    [Reflect, URL, PerWorldBindings, ActivityLogging=SetterForIsolatedWorlds] attribute DOMString src;
+    [Reflect] attribute DOMString type;
+    [Reflect] attribute DOMString width;
+    [Custom, NotEnumerable] getter boolean (unsigned long index);
+    [Custom] setter boolean (unsigned long index, Node value);
+    [Custom, NotEnumerable] getter Node (DOMString name);
+    [Custom] setter Node (DOMString name, Node value);
 
-[CheckSecurity=Node, RaisesException] SVGDocument getSVGDocument();
+    [CheckSecurity=Node, RaisesException] SVGDocument getSVGDocument();
 };
-