Turn styleWillChange |newStyle| into a reference

Source/core/rendering/RenderScrollbarPart.cpp

 /*
  * Copyright (C) 2008 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 122 matching lines @@
 void RenderScrollbarPart::computePreferredLogicalWidths()
 {
     if (!preferredLogicalWidthsDirty())
         return;
 
     m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = 0;
 
     clearPreferredLogicalWidthsDirty();
 }
 
-void RenderScrollbarPart::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
+void RenderScrollbarPart::styleWillChange(StyleDifference diff, const RenderStyle& newStyle)
 {
     RenderBlock::styleWillChange(diff, newStyle);
     setInline(false);
 }
 
 void RenderScrollbarPart::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
 {
     RenderBlock::styleDidChange(diff, oldStyle);
     setInline(false);
     clearPositionedState();
@@ skipping 43 matching lines @@
 }
 
 RenderObject* RenderScrollbarPart::rendererOwningScrollbar() const
 {
     if (!m_scrollbar)
         return 0;
     return m_scrollbar->owningRenderer();
 }
 
 }