Measure usage for DocumentType attributes removed from DOM4

Source/core/dom/DocumentType.idl

Index: Source/core/dom/DocumentType.idl
diff --git a/Source/core/dom/DocumentType.idl b/Source/core/dom/DocumentType.idl
index 8f192f3f5621f59dbdadd03c27750200a47f59e9..510240a13623f129da784a1efcc4ddf7f7767d53 100644
--- a/Source/core/dom/DocumentType.idl
+++ b/Source/core/dom/DocumentType.idl
@@ -22,14 +22,14 @@ interface DocumentType : Node {
     // DOM Level 1
 
     readonly attribute DOMString name;
-    readonly attribute NamedNodeMap entities;
-    readonly attribute NamedNodeMap notations;
+    [MeasureAs=DocumentTypeEntities] readonly attribute NamedNodeMap entities; // Removed from DOM4.
+    [MeasureAs=DocumentTypeNotations] readonly attribute NamedNodeMap notations; // Removed from DOM4.
 
     // DOM Level 2
 
     [TreatReturnedNullStringAs=Null] readonly attribute DOMString publicId;
     [TreatReturnedNullStringAs=Null] readonly attribute DOMString systemId;
-    [TreatReturnedNullStringAs=Null] readonly attribute DOMString internalSubset;
+    [TreatReturnedNullStringAs=Null, MeasureAs=DocumentTypeInternalSubset] readonly attribute DOMString internalSubset; // Removed from DOM4.
 };
 
 DocumentType implements ChildNode;