Oilpan: use transition types for remaining RefPtr<Document>s in dom/.

Source/core/timing/PerformanceResourceTiming.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 56 matching lines @@
     double domainLookupEnd() const;
     double connectStart() const;
     double connectEnd() const;
     double secureConnectionStart() const;
     double requestStart() const;
     double responseStart() const;
     double responseEnd() const;
 
     virtual bool isResource() OVERRIDE { return true; }
 
-    virtual void trace(Visitor* visitor)
-    {
-        PerformanceEntry::trace(visitor);
-    }
+    virtual void trace(Visitor*) OVERRIDE;
 
 private:
     PerformanceResourceTiming(const ResourceTimingInfo&, Document* requestingDocument, double startTime, double lastRedirectEndTime, bool m_allowTimingDetails, bool m_allowRedirectDetails);
     virtual ~PerformanceResourceTiming();
 
     AtomicString m_initiatorType;
     RefPtr<ResourceLoadTiming> m_timing;
     double m_lastRedirectEndTime;
     double m_finishTime;
     bool m_didReuseConnection;
     bool m_allowTimingDetails;
     bool m_allowRedirectDetails;
-    RefPtr<Document> m_requestingDocument;
+    RefPtrWillBeMember<Document> m_requestingDocument;
 };
 
 }
 
 #endif // !defined(PerformanceResourceTiming_h)