NodeFilter#acceptNode argument node should not be optional

third_party/WebKit/Source/core/dom/NodeFilter.idl

Index: third_party/WebKit/Source/core/dom/NodeFilter.idl
diff --git a/third_party/WebKit/Source/core/dom/NodeFilter.idl b/third_party/WebKit/Source/core/dom/NodeFilter.idl
index b4d6ccb6e3aaefd420e52ba0cf40ab3839c57930..90dc8edba44fa7c06e0615f0d4a06be10bc23845 100644
--- a/third_party/WebKit/Source/core/dom/NodeFilter.idl
+++ b/third_party/WebKit/Source/core/dom/NodeFilter.idl
@@ -46,6 +46,5 @@
     // This function declaration doesn't generate any code because
     // V8NodeFilterCondition represents this callback interface in Blink.
     // TODO(bashi): Fix crbug.com/630986, and use generated code.
-    // FIXME: The node argument should not be optional.
-    [RaisesException] unsigned short acceptNode([Default=Undefined] optional Node node);
+    [RaisesException] unsigned short acceptNode(Node node);
 };