Make RenderObject::style() return a const object

Source/core/svg/SVGFEFloodElement.cpp

Index: Source/core/svg/SVGFEFloodElement.cpp
diff --git a/Source/core/svg/SVGFEFloodElement.cpp b/Source/core/svg/SVGFEFloodElement.cpp
index aad1eadfc47f906da40ba5c9167a7da35bf04545..b1b15e51bab0c680e9722284ceecf827103264e6 100644
--- a/Source/core/svg/SVGFEFloodElement.cpp
+++ b/Source/core/svg/SVGFEFloodElement.cpp
@@ -39,14 +39,13 @@ bool SVGFEFloodElement::setFilterEffectAttribute(FilterEffect* effect, const Qua
 {
     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;