Make RenderObject::style() return a const object

Source/core/svg/SVGLinearGradientElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
  * 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
@@ skipping 74 matching lines @@
 
     SVGElement::InvalidationGuard invalidationGuard(this);
 
     updateRelativeLengthsInformation();
 
     RenderSVGResourceContainer* renderer = toRenderSVGResourceContainer(this->renderer());
     if (renderer)
         renderer->invalidateCacheAndMarkForLayout();
 }
 
-RenderObject* SVGLinearGradientElement::createRenderer(RenderStyle*)
+RenderObject* SVGLinearGradientElement::createRenderer(const RenderStyle*)
 {
     return new RenderSVGResourceLinearGradient(this);
 }
 
 static void setGradientAttributes(SVGGradientElement* element, LinearGradientAttributes& attributes, bool isLinear = true)
 {
     if (!attributes.hasSpreadMethod() && element->spreadMethod()->isSpecified())
         attributes.setSpreadMethod(element->spreadMethod()->currentValue()->enumValue());
 
     if (!attributes.hasGradientUnits() && element->gradientUnits()->isSpecified())
@@ skipping 65 matching lines @@
 
 bool SVGLinearGradientElement::selfHasRelativeLengths() const
 {
     return m_x1->currentValue()->isRelative()
         || m_y1->currentValue()->isRelative()
         || m_x2->currentValue()->isRelative()
         || m_y2->currentValue()->isRelative();
 }
 
 } // namespace blink