Drop NotEnumerable for the on* event handler IDL attributes (again)

Source/core/html/HTMLFrameSetElement.idl

Index: Source/core/html/HTMLFrameSetElement.idl
diff --git a/Source/core/html/HTMLFrameSetElement.idl b/Source/core/html/HTMLFrameSetElement.idl
index 8a09ca1bfe0723ede49f792a4cb30fe2783ad710..455f8ee3c679729ed9aa3a7f5a9a8cf6237bece3 100644
--- a/Source/core/html/HTMLFrameSetElement.idl
+++ b/Source/core/html/HTMLFrameSetElement.idl
@@ -24,28 +24,28 @@ interface HTMLFrameSetElement : HTMLElement {
     [Reflect, TreatNullAs=NullString] attribute DOMString rows;
 
     // Event handler attributes
-    [NotEnumerable] attribute EventHandler onbeforeunload;
-    [NotEnumerable] attribute EventHandler onhashchange;
-    [NotEnumerable] attribute EventHandler onmessage;
-    [NotEnumerable] attribute EventHandler onoffline;
-    [NotEnumerable] attribute EventHandler ononline;
-    [NotEnumerable] attribute EventHandler onpopstate;
-    [NotEnumerable] attribute EventHandler onresize;
-    [NotEnumerable] attribute EventHandler onstorage;
-    [NotEnumerable] attribute EventHandler onunload;
+    attribute EventHandler onbeforeunload;
+    attribute EventHandler onhashchange;
+    attribute EventHandler onmessage;
+    attribute EventHandler onoffline;
+    attribute EventHandler ononline;
+    attribute EventHandler onpopstate;
+    attribute EventHandler onresize;
+    attribute EventHandler onstorage;
+    attribute EventHandler onunload;
 
-    [Conditional=ORIENTATION_EVENTS, NotEnumerable] attribute EventHandler onorientationchange;
+    [Conditional=ORIENTATION_EVENTS] attribute EventHandler onorientationchange;
 
     // Overrides of Element attributes (with different implementation in bindings).
-    [NotEnumerable] attribute EventHandler onblur;
-    [NotEnumerable] attribute EventHandler onerror;
-    [NotEnumerable] attribute EventHandler onfocus;
-    [NotEnumerable] attribute EventHandler onload;
+    attribute EventHandler onblur;
+    attribute EventHandler onerror;
+    attribute EventHandler onfocus;
+    attribute EventHandler onload;
 
     // Not implemented yet.
-    // attribute [NotEnumerable] EventHandler onafterprint;
-    // attribute [NotEnumerable] EventHandler onbeforeprint;
-    // attribute [NotEnumerable] EventHandler onredo;
-    // attribute [NotEnumerable] EventHandler onundo;
+    // attribute EventHandler onafterprint;
+    // attribute EventHandler onbeforeprint;
+    // attribute EventHandler onredo;
+    // attribute EventHandler onundo;
 };