Make RenderObject::style() return a const object

Source/core/dom/PseudoElement.cpp

Index: Source/core/dom/PseudoElement.cpp
diff --git a/Source/core/dom/PseudoElement.cpp b/Source/core/dom/PseudoElement.cpp
index 559b1742fd5bb4e43ba40de4f827900c7eade58f..fbcff2da162c7eacadca466276260b12207b75f7 100644
--- a/Source/core/dom/PseudoElement.cpp
+++ b/Source/core/dom/PseudoElement.cpp
@@ -120,7 +120,7 @@ void PseudoElement::attach(const AttachContext& context)
     if (!renderer)
         return;
 
-    RenderStyle* style = renderer->style();
+    RenderStyle* style = renderer->deprecatedMutableStyle();
     if (style->styleType() != BEFORE && style->styleType() != AFTER)
         return;
     ASSERT(style->contentData());
@@ -154,7 +154,7 @@ void PseudoElement::didRecalcStyle(StyleRecalcChange)
         if (!child->isText() && !child->isQuote() && !child->isImage())
             continue;
 
-        child->setPseudoStyle(renderer->style());
+        child->setPseudoStyle(renderer->deprecatedMutableStyle());
     }
 }