Add [CEReactions] IDL attributes for Custom Elements V1

third_party/WebKit/Source/core/html/HTMLMenuElement.idl

Index: third_party/WebKit/Source/core/html/HTMLMenuElement.idl
diff --git a/third_party/WebKit/Source/core/html/HTMLMenuElement.idl b/third_party/WebKit/Source/core/html/HTMLMenuElement.idl
index 9d54c09786fcfeee7c9be4214a1971d07d1f8200..d69da84feeba76e9ab77fde9bc0fa767b2937698 100644
--- a/third_party/WebKit/Source/core/html/HTMLMenuElement.idl
+++ b/third_party/WebKit/Source/core/html/HTMLMenuElement.idl
@@ -20,10 +20,10 @@
 // https://html.spec.whatwg.org/#the-menu-element
 
 interface HTMLMenuElement : HTMLElement {
-    [RuntimeEnabled=ContextMenu, Reflect] attribute DOMString type;
-    [RuntimeEnabled=ContextMenu, Reflect] attribute DOMString label;
+    [CEReactions, RuntimeEnabled=ContextMenu, Reflect] attribute DOMString type;
+    [CEReactions, RuntimeEnabled=ContextMenu, Reflect] attribute DOMString label;
 
     // obsolete members
     // https://html.spec.whatwg.org/#HTMLMenuElement-partial
-    [Reflect] attribute boolean compact;
+    [CEReactions, Reflect] attribute boolean compact;
 };