Page::chrome() should return a reference.

Source/core/page/Page.h

Index: Source/core/page/Page.h
diff --git a/Source/core/page/Page.h b/Source/core/page/Page.h
index 437c6d684ee7f41dafc572fdfd64a53fc2a01318..1aa0fe49fc955d0a68e53d15de50a3af53254337 100644
--- a/Source/core/page/Page.h
+++ b/Source/core/page/Page.h
@@ -156,7 +156,7 @@ public:
     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(); }
@@ -336,7 +336,7 @@ private:
     bool m_isPainting;
 #endif
 
-    OwnPtr<PageConsole> m_console;
+    const OwnPtr<PageConsole> m_console;
 
     HashSet<MultisamplingChangedObserver*> m_multisamplingChangedObservers;
 };