Page::chrome() should return a reference.

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 261 matching lines @@
     
     void updateFirstPartyForCookies();
     void setFirstPartyForCookies(const KURL&);
 
     void clearProvisionalLoad();
     void transitionToCommitted();
     void frameLoadCompleted();
 
     SubstituteData defaultSubstituteDataForURL(const KURL&);
     
-    bool fireBeforeUnloadEvent(Chrome*);
+    bool fireBeforeUnloadEvent(Chrome&);
 
     void checkNavigationPolicyAndContinueLoad(PassRefPtr<FormState>);
     void checkNavigationPolicyAndContinueFragmentScroll(const NavigationAction&);
     void checkNewWindowPolicyAndContinue(PassRefPtr<FormState>, const String& frameName, const NavigationAction&);
 
     bool shouldPerformFragmentNavigation(bool isFormSubmission, const String& httpMethod, FrameLoadType, const KURL&);
     void scrollToFragmentWithParentBoundary(const KURL&);
 
     void checkLoadCompleteForThisFrame();
 
@@ skipping 100 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