Make NodeFilter a legacy callback interface.

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 e9dc637aaa12681e5111ed7e2eaf9df26122045e..bde7982d522eca94a0e93fc178ecee3b8097d5a8 100644
--- a/third_party/WebKit/Source/core/dom/NodeFilter.idl
+++ b/third_party/WebKit/Source/core/dom/NodeFilter.idl
@@ -20,10 +20,9 @@
 
 // https://dom.spec.whatwg.org/#interface-nodefilter
 
-// FIXME: NodeFilter should be a callback interface. crbug.com/462946
 [
     DependentLifetime,
-] interface NodeFilter {
+] callback interface NodeFilter {
     // Constants for acceptNode()
     const unsigned short FILTER_ACCEPT = 1;
     const unsigned short FILTER_REJECT = 2;
@@ -44,6 +43,9 @@
     const unsigned long SHOW_DOCUMENT_FRAGMENT = 0x400;
     const unsigned long SHOW_NOTATION = 0x800; // historical
 
+    // This function declaration doesn't generate any code because
+    // V8NodeFilterCondition represents this callback interface in Blink.
+    // TODO(tkent): Fix crbug.com/630986

[bashi, 2017/04/28 06:28:34]

Also feel free to assign this to me if fixing 630986 is beyond fixing
NodeFilter.

     // FIXME: The node argument should not be optional.
-    [RaisesException, LegacyInterfaceTypeChecking] unsigned short acceptNode([Default=Undefined] optional Node node);
+    [RaisesException] unsigned short acceptNode([Default=Undefined] optional Node node);
 };