Oilpan: Prepare to move FormController and DocumentState to Oilpan heap, and remove RefPtrs to HTML…

Source/core/loader/HistoryItem.h

 /*
  * Copyright (C) 2006, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Research In Motion Limited. 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
@@ skipping 89 matching lines @@
 private:
     HistoryItem();
 
     String m_urlString;
     Referrer m_referrer;
     String m_target;
 
     IntPoint m_scrollPoint;
     float m_pageScaleFactor;
     Vector<String> m_documentStateVector;
-    RefPtr<DocumentState> m_documentState;
+    RefPtrWillBePersistent<DocumentState> m_documentState;
 
     // If two HistoryItems have the same item sequence number, then they are
     // clones of one another. Traversing history from one such HistoryItem to
     // another is a no-op. HistoryItem clones are created for parent and
     // sibling frames when only a subframe navigates.
     int64_t m_itemSequenceNumber;
 
     // If two HistoryItems have the same document sequence number, then they
     // refer to the same instance of a document. Traversing history from one
     // such HistoryItem to another preserves the document.
     int64_t m_documentSequenceNumber;
 
     // Support for HTML5 History
     RefPtr<SerializedScriptValue> m_stateObject;
 
     // info used to repost form data
     RefPtr<FormData> m_formData;
     AtomicString m_formContentType;
 
 }; // class HistoryItem
 
 } // namespace WebCore
 
 #endif // HISTORYITEM_H