Oilpan: have xml/ objects on the heap by default.

Source/core/xml/XPathEvaluator.h

 /*
  * Copyright 2005 Frerich Raabe <raabe@kde.org>
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 11 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef XPathEvaluator_h
 #define XPathEvaluator_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "platform/heap/Handle.h"
-#include "wtf/Forward.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefCounted.h"
 
 namespace blink {
 
 class ExceptionState;
 class Node;
 class ScriptValue;
 class XPathExpression;
 class XPathNSResolver;
 class XPathResult;
 
-class XPathEvaluator final : public RefCountedWillBeGarbageCollected<XPathEvaluator>, public ScriptWrappable {
+class XPathEvaluator final : public GarbageCollected<XPathEvaluator>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static PassRefPtrWillBeRawPtr<XPathEvaluator> create()
+    static XPathEvaluator* create()
     {
-        return adoptRefWillBeNoop(new XPathEvaluator);
+        return new XPathEvaluator;
     }
 
-    PassRefPtrWillBeRawPtr<XPathExpression> createExpression(const String& expression, PassRefPtrWillBeRawPtr<XPathNSResolver>, ExceptionState&);
-    PassRefPtrWillBeRawPtr<XPathNSResolver> createNSResolver(Node* nodeResolver);
-    PassRefPtrWillBeRawPtr<XPathResult> evaluate(const String& expression, Node* contextNode,
-        PassRefPtrWillBeRawPtr<XPathNSResolver>, unsigned short type, const ScriptValue&, ExceptionState&);
+    XPathExpression* createExpression(const String& expression, XPathNSResolver*, ExceptionState&);
+    XPathNSResolver* createNSResolver(Node* nodeResolver);
+    XPathResult* evaluate(const String& expression, Node* contextNode,
+        XPathNSResolver*, unsigned short type, const ScriptValue&, ExceptionState&);
 
     DEFINE_INLINE_TRACE() { }
 
 private:
     XPathEvaluator() { }
 };
 
 } // namespace blink
 
 #endif // XPathEvaluator_h