Oilpan: Move core/xml/ to oilpan's heap

Source/core/xml/XPathNSResolver.h

Index: Source/core/xml/XPathNSResolver.h
diff --git a/Source/core/xml/XPathNSResolver.h b/Source/core/xml/XPathNSResolver.h
index fc761f6459e8e0df33b258b0b33db1a147a4ceb3..e6762c0b01f54d69a903db8066f6aec3838ff237 100644
--- a/Source/core/xml/XPathNSResolver.h
+++ b/Source/core/xml/XPathNSResolver.h
@@ -28,16 +28,20 @@
 #define XPathNSResolver_h
 
 #include "bindings/v8/ScriptWrappable.h"
+#include "heap/Handle.h"
 #include "wtf/Forward.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
-class XPathNSResolver : public RefCounted<XPathNSResolver>, public ScriptWrappable {
+class XPathNSResolver : public RefCountedWillBeGarbageCollectedFinalized<XPathNSResolver>, public ScriptWrappable {
+    DECLARE_GC_INFO;
 public:
     virtual ~XPathNSResolver();
     virtual AtomicString lookupNamespaceURI(const String& prefix) = 0;
 
+    virtual void trace(Visitor*) { }
+
 protected:
     XPathNSResolver()
     {