Page::chrome() should return a reference.

Source/core/page/Page.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 138 matching lines @@
     {
         if (!m_group)
             setGroupType(PrivatePageGroup);
         return *m_group;
     }
 
     void incrementSubframeCount() { ++m_subframeCount; }
     void decrementSubframeCount() { ASSERT(m_subframeCount); --m_subframeCount; }
     int subframeCount() const { checkSubframeCountConsistency(); return m_subframeCount; }
 
-    Chrome* chrome() const { return m_chrome.get(); }
+    Chrome& chrome() const { return *m_chrome; }
     DragCaretController* dragCaretController() const { return m_dragCaretController.get(); }
     DragController* dragController() const { return m_dragController.get(); }
     FocusController* focusController() const { return m_focusController.get(); }
     ContextMenuController* contextMenuController() const { return m_contextMenuController.get(); }
     InspectorController* inspectorController() const { return m_inspectorController.get(); }
     PointerLockController* pointerLockController() const { return m_pointerLockController.get(); }
     ValidationMessageClient* validationMessageClient() const { return m_validationMessageClient; }
     void setValidationMessageClient(ValidationMessageClient* client) { m_validationMessageClient = client; }
 
     ScrollingCoordinator* scrollingCoordinator();
@@ skipping 159 matching lines @@
 
     HashSet<RenderObject*> m_relevantUnpaintedRenderObjects;
     Region m_topRelevantPaintedRegion;
     Region m_bottomRelevantPaintedRegion;
     Region m_relevantUnpaintedRegion;
     bool m_isCountingRelevantRepaintedObjects;
 #ifndef NDEBUG
     bool m_isPainting;
 #endif
 
-    OwnPtr<PageConsole> m_console;
+    const OwnPtr<PageConsole> m_console;
 
     HashSet<MultisamplingChangedObserver*> m_multisamplingChangedObservers;
 };
 
 } // namespace WebCore
     
 #endif // Page_h