Page::chrome() should return a reference.

Source/core/rendering/RenderLayerBacking.cpp

 /*
  * Copyright (C) 2009, 2010, 2011 Apple 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:
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 109 matching lines @@
     updateBackgroundLayer(false);
     updateMaskLayer(false);
     updateScrollingLayers(false);
     destroyGraphicsLayers();
 }
 
 PassOwnPtr<GraphicsLayer> RenderLayerBacking::createGraphicsLayer(const String& name, CompositingReasons reasons)
 {
     GraphicsLayerFactory* graphicsLayerFactory = 0;
     if (Page* page = renderer()->frame()->page())
-        graphicsLayerFactory = page->chrome()->client()->graphicsLayerFactory();
+        graphicsLayerFactory = page->chrome().client()->graphicsLayerFactory();
 
     OwnPtr<GraphicsLayer> graphicsLayer = GraphicsLayer::create(graphicsLayerFactory, this);
 
 #ifndef NDEBUG
     graphicsLayer->setName(name);
 #else
     UNUSED_PARAM(name);
 #endif
 
     graphicsLayer->setCompositingReasons(reasons);
@@ skipping 1826 matching lines @@
     info.addMember(m_childContainmentLayer, "childContainmentLayer");
     info.addMember(m_maskLayer, "maskLayer");
     info.addMember(m_layerForHorizontalScrollbar, "layerForHorizontalScrollbar");
     info.addMember(m_layerForVerticalScrollbar, "layerForVerticalScrollbar");
     info.addMember(m_layerForScrollCorner, "layerForScrollCorner");
     info.addMember(m_scrollingLayer, "scrollingLayer");
     info.addMember(m_scrollingContentsLayer, "scrollingContentsLayer");
 }
 
 } // namespace WebCore