Enable Oilpan for core/xml/

Source/core/xml/NativeXPathNSResolver.h

Index: Source/core/xml/NativeXPathNSResolver.h
diff --git a/Source/core/xml/NativeXPathNSResolver.h b/Source/core/xml/NativeXPathNSResolver.h
index bed67bdd86b7fdf815d517f70f94adce66789510..32d5682435ae8879a330a7f2f77c69fe4231f572 100644
--- a/Source/core/xml/NativeXPathNSResolver.h
+++ b/Source/core/xml/NativeXPathNSResolver.h
@@ -35,9 +35,9 @@ class Node;
 
 class NativeXPathNSResolver final : public XPathNSResolver {
 public:
-    static PassRefPtrWillBeRawPtr<NativeXPathNSResolver> create(PassRefPtrWillBeRawPtr<Node> node)
+    static NativeXPathNSResolver* create(PassRefPtrWillBeRawPtr<Node> node)
     {
-        return adoptRefWillBeNoop(new NativeXPathNSResolver(node));
+        return new NativeXPathNSResolver(node);
     }
 
     virtual AtomicString lookupNamespaceURI(const String& prefix) override;