Pass more const RenderObject& in the vicinity of paint-servers

Source/core/rendering/svg/RenderSVGResourceSolidColor.cpp

 /*
  * Copyright (C) Research In Motion Limited 2010. 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 14 matching lines @@
 const RenderSVGResourceType RenderSVGResourceSolidColor::s_resourceType = SolidColorResourceType;
 
 RenderSVGResourceSolidColor::RenderSVGResourceSolidColor()
 {
 }
 
 RenderSVGResourceSolidColor::~RenderSVGResourceSolidColor()
 {
 }
 
-SVGPaintServer RenderSVGResourceSolidColor::preparePaintServer(RenderObject* object)
+SVGPaintServer RenderSVGResourceSolidColor::preparePaintServer(const RenderObject&)
 {
-    ASSERT_UNUSED(object, object);
-
     return SVGPaintServer(m_color);
 }
 
 }