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

Source/core/xml/XPathExpression.h

Index: Source/core/xml/XPathExpression.h
diff --git a/Source/core/xml/XPathExpression.h b/Source/core/xml/XPathExpression.h
index 90869e2aba9e4636845febe485ba0f2034c97e37..5fbfca15126592a249c1aedaa6005d0848615cdf 100644
--- a/Source/core/xml/XPathExpression.h
+++ b/Source/core/xml/XPathExpression.h
@@ -30,8 +30,6 @@
 #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 {
 
@@ -45,24 +43,23 @@ namespace XPath {
 class Expression;
 }
 
-class XPathExpression : public RefCountedWillBeGarbageCollected<XPathExpression>, public ScriptWrappable {
-    DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(XPathExpression);
+class XPathExpression : public GarbageCollected<XPathExpression>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static PassRefPtrWillBeRawPtr<XPathExpression> create()
+    static XPathExpression* create()
     {
-        return adoptRefWillBeNoop(new XPathExpression);
+        return new XPathExpression;
     }
 
-    static PassRefPtrWillBeRawPtr<XPathExpression> createExpression(const String& expression, PassRefPtrWillBeRawPtr<XPathNSResolver>, ExceptionState&);
-    PassRefPtrWillBeRawPtr<XPathResult> evaluate(Node* contextNode, unsigned short type, const ScriptValue&, ExceptionState&);
+    static XPathExpression* createExpression(const String& expression, XPathNSResolver*, ExceptionState&);
+    XPathResult* evaluate(Node* contextNode, unsigned short type, const ScriptValue&, ExceptionState&);
 
     DECLARE_TRACE();
 
 private:
     XPathExpression();
 
-    OwnPtrWillBeMember<XPath::Expression> m_topExpression;
+    Member<XPath::Expression> m_topExpression;
 };
 
 } // namespace blink