Turn styleWillChange |newStyle| into a reference

Source/core/rendering/RenderBlock.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * 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.
@@ skipping 300 matching lines @@
     // Delay update scrollbar until finishDelayRepaint() will be
     // called. This function is used when a flexbox is laying out its
     // descendant. If multiple calls are made to startDelayRepaint(),
     // finishDelayRepaint() will do nothing until finishDelayRepaint()
     // is called the same number of times.
     static void startDelayUpdateScrollInfo();
     static void finishDelayUpdateScrollInfo();
 
     void updateScrollInfoAfterLayout();
 
-    virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle) OVERRIDE;
+    virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) OVERRIDE;
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE;
 
     virtual bool hasLineIfEmpty() const;
 
     bool simplifiedLayout();
     virtual void simplifiedNormalFlowLayout();
 
     void setDesiredColumnCountAndWidth(int, LayoutUnit);
 
 public:
@@ skipping 216 matching lines @@
     // FIXME: This is temporary as we move code that accesses block flow
     // member variables out of RenderBlock and into RenderBlockFlow.
     friend class RenderBlockFlow;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBlock, isRenderBlock());
 
 } // namespace WebCore
 
 #endif // RenderBlock_h