Options length setter should process custom elements reactions

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

Index: third_party/WebKit/Source/core/html/HTMLOptionsCollection.idl
diff --git a/third_party/WebKit/Source/core/html/HTMLOptionsCollection.idl b/third_party/WebKit/Source/core/html/HTMLOptionsCollection.idl
index c0838a4f0fdd8a0cb3c7c9c010ddf1f031bc06e8..f5e32f3f5982918263e0e2996b1d989733b14f9f 100644
--- a/third_party/WebKit/Source/core/html/HTMLOptionsCollection.idl
+++ b/third_party/WebKit/Source/core/html/HTMLOptionsCollection.idl
@@ -26,7 +26,7 @@
     SetWrapperReferenceFrom=ownerNode,
 ] interface HTMLOptionsCollection : HTMLCollection {
     // inherits item()
-    [RaisesException=Setter] attribute unsigned long length; // shadows inherited length
+    [CEReactions, RaisesException=Setter] attribute unsigned long length; // shadows inherited length
     // FIXME: The spec has a legacycaller HTMLOptionElement? (DOMString name);
     [CEReactions, RaisesException] setter void (unsigned long index, HTMLOptionElement? option);
     [CEReactions, RaisesException] void add((HTMLOptionElement or HTMLOptGroupElement) element, optional (HTMLElement or long)? before = null);