Oilpan: have PendingScripts trace their script elements.

Source/core/dom/PendingScript.h

 /*
  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 11 matching lines @@
  * (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 PendingScript_h
 #define PendingScript_h
 
 #include "core/fetch/ResourceClient.h"
 #include "core/fetch/ResourceOwner.h"
 #include "core/fetch/ScriptResource.h"
+#include "platform/heap/Handle.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 #include "wtf/text/TextPosition.h"
 
 namespace WebCore {
 
 class Element;
 class ScriptResource;
 
 // A container for an external script which may be loaded and executed.
 //
 // A ResourcePtr alone does not prevent the underlying Resource
 // from purging its data buffer. This class holds a dummy client open for its
 // lifetime in order to guarantee that the data buffer will not be purged.
-class PendingScript : public ResourceOwner<ScriptResource> {
+class PendingScript FINAL : public ResourceOwner<ScriptResource> {
+    ALLOW_ONLY_INLINE_ALLOCATION();
 public:
     PendingScript()
         : m_watchingForLoad(false)
         , m_startingPosition(TextPosition::belowRangePosition())
     {
     }
 
     PendingScript(Element* element, ScriptResource* resource)
         : m_watchingForLoad(false)
         , m_element(element)
@@ skipping 26 matching lines @@
     }
 
     TextPosition startingPosition() const { return m_startingPosition; }
     void setStartingPosition(const TextPosition& position) { m_startingPosition = position; }
 
     bool watchingForLoad() const { return m_watchingForLoad; }
     void setWatchingForLoad(bool b) { m_watchingForLoad = b; }
 
     Element* element() const { return m_element.get(); }
     void setElement(Element* element) { m_element = element; }
-    PassRefPtr<Element> releaseElementAndClear();
+    PassRefPtrWillBeRawPtr<Element> releaseElementAndClear();
 
     void setScriptResource(ScriptResource*);
 
     virtual void notifyFinished(Resource*);
 
+    void trace(Visitor*);
+
 private:
     bool m_watchingForLoad;
-    RefPtr<Element> m_element;
+    RefPtrWillBeMember<Element> m_element;
     TextPosition m_startingPosition; // Only used for inline script tags.
 };
 
 }
 
 #endif