Make RenderObject::style() return a const object

Source/core/svg/SVGElement.cpp

Index: Source/core/svg/SVGElement.cpp
diff --git a/Source/core/svg/SVGElement.cpp b/Source/core/svg/SVGElement.cpp
index 0c28644a2127af181a58cfbc7358966f02de4526..2dab96a8cae4963ac164598c3a37a9c18a1a994e 100644
--- a/Source/core/svg/SVGElement.cpp
+++ b/Source/core/svg/SVGElement.cpp
@@ -909,7 +909,7 @@ PassRefPtr<RenderStyle> SVGElement::customStyleForRenderer()
     if (!correspondingElement())
         return document().ensureStyleResolver().styleForElement(this);
 
-    RenderStyle* style = 0;
+    const RenderStyle* style = 0;
     if (Element* parent = parentOrShadowHostElement()) {
         if (RenderObject* renderer = parent->renderer())
             style = renderer->style();
@@ -944,7 +944,7 @@ RenderStyle* SVGElement::computedStyle(PseudoId pseudoElementSpecifier)
     RenderStyle* parentStyle = 0;
     if (Element* parent = parentOrShadowHostElement()) {
         if (RenderObject* renderer = parent->renderer())
-            parentStyle = renderer->style();
+            parentStyle = renderer->deprecatedMutableStyle();
     }
 
     return svgRareData()->overrideComputedStyle(this, parentStyle);