Simply FrameLoaderStateMachine and FrameLoader::transitionToCommitted().

Source/core/loader/FrameLoader.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) Research In Motion Limited 2009. All rights reserved.
  * Copyright (C) 2011 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:
  *
@@ skipping 376 matching lines @@
 
     String m_outgoingReferrer;
 
     bool m_isExecutingJavaScriptFormAction;
 
     bool m_didCallImplicitClose;
     bool m_wasUnloadEventEmitted;
     PageDismissalType m_pageDismissalEventBeingDispatched;
     bool m_isComplete;
 
-    RefPtr<SerializedScriptValue> m_pendingStateObject;
-
     bool m_needsClear;
 
     KURL m_submittedFormURL;
 
     Timer<FrameLoader> m_checkTimer;
     bool m_shouldCallCheckCompleted;
     bool m_shouldCallCheckLoadComplete;
 
     Frame* m_opener;
     HashSet<Frame*> m_openedFrames;
@@ skipping 15 matching lines @@
 // the frame name references a frame different from the openerFrame, e.g. when it is
 // "_self" or "_parent".
 //
 // FIXME: Consider making this function part of an appropriate class (not FrameLoader)
 // and moving it to a more appropriate location.
 Frame* createWindow(Frame* openerFrame, Frame* lookupFrame, const FrameLoadRequest&, const WindowFeatures&, bool& created);
 
 } // namespace WebCore
 
 #endif // FrameLoader_h