Make RenderObject::style() return a const object

Source/core/svg/SVGFEFloodElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007, 2008 Rob Buis <buis@kde.org>
  *
  * 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,
@@ skipping 21 matching lines @@
     : SVGFilterPrimitiveStandardAttributes(SVGNames::feFloodTag, document)
 {
 }
 
 DEFINE_NODE_FACTORY(SVGFEFloodElement)
 
 bool SVGFEFloodElement::setFilterEffectAttribute(FilterEffect* effect, const QualifiedName& attrName)
 {
     LayoutObject* renderer = this->renderer();
     ASSERT(renderer);
-    LayoutStyle* style = renderer->style();
-    ASSERT(style);
+    const LayoutStyle& style = renderer->styleRef();
     FEFlood* flood = static_cast<FEFlood*>(effect);
 
     if (attrName == SVGNames::flood_colorAttr)
-        return flood->setFloodColor(style->svgStyle().floodColor());
+        return flood->setFloodColor(style.svgStyle().floodColor());
     if (attrName == SVGNames::flood_opacityAttr)
-        return flood->setFloodOpacity(style->svgStyle().floodOpacity());
+        return flood->setFloodOpacity(style.svgStyle().floodOpacity());
 
     ASSERT_NOT_REACHED();
     return false;
 }
 
 PassRefPtrWillBeRawPtr<FilterEffect> SVGFEFloodElement::build(SVGFilterBuilder*, Filter* filter)
 {
     LayoutObject* renderer = this->renderer();
     if (!renderer)
         return nullptr;
 
     ASSERT(renderer->style());
     const SVGLayoutStyle& svgStyle = renderer->style()->svgStyle();
 
     Color color = svgStyle.floodColor();
     float opacity = svgStyle.floodOpacity();
 
     return FEFlood::create(filter, color, opacity);
 }
 
 }