Un-deprecate APIs which have been un-removed in the DOM Standard

Source/core/frame/UseCounter.cpp

Index: Source/core/frame/UseCounter.cpp
diff --git a/Source/core/frame/UseCounter.cpp b/Source/core/frame/UseCounter.cpp
index 8181c088aec15135dd4950b15d51f319884151c2..0020f1fa57345fd234e946b5cd2e04a934f932b2 100644
--- a/Source/core/frame/UseCounter.cpp
+++ b/Source/core/frame/UseCounter.cpp
@@ -754,12 +754,6 @@ String UseCounter::deprecationMessage(Feature feature)
     case PrefixedCancelRequestAnimationFrame:
         return "'webkitCancelRequestAnimationFrame' is vendor-specific. Please use the standard 'cancelAnimationFrame' instead.";
 
-    case DocumentCreateAttributeNS:
-        return "'Document.createAttributeNS' is deprecated and has been removed from DOM4 (http://w3.org/tr/dom).";
-
-    case AttributeOwnerElement:
-        return "'Attr.ownerElement' is deprecated and has been removed from DOM4 (http://w3.org/tr/dom).";
-
     case ElementSetAttributeNodeNS:
         return "'Element.setAttributeNodeNS' is deprecated and has been removed from DOM4 (http://w3.org/tr/dom).";