Pass RenderStyle / RenderObject by reference in more places

Source/core/frame/animation/KeyframeAnimation.h

Index: Source/core/frame/animation/KeyframeAnimation.h
diff --git a/Source/core/frame/animation/KeyframeAnimation.h b/Source/core/frame/animation/KeyframeAnimation.h
index 82c198aed9b515362888a75b5305f92ee1631ca7..93334d93c6204affe81a2b211a70b120c1802350 100644
--- a/Source/core/frame/animation/KeyframeAnimation.h
+++ b/Source/core/frame/animation/KeyframeAnimation.h
@@ -41,7 +41,7 @@ class RenderStyle;
 // for a single RenderObject.
 class KeyframeAnimation : public AnimationBase {
 public:
-    static PassRefPtr<KeyframeAnimation> create(const CSSAnimationData* animation, RenderObject* renderer, int index, CompositeAnimation* compositeAnimation, RenderStyle* unanimatedStyle)
+    static PassRefPtr<KeyframeAnimation> create(const CSSAnimationData* animation, RenderObject& renderer, int index, CompositeAnimation* compositeAnimation, RenderStyle& unanimatedStyle)
     {
         return adoptRef(new KeyframeAnimation(animation, renderer, index, compositeAnimation, unanimatedStyle));
     };
@@ -80,7 +80,7 @@ protected:
     void checkForMatchingFilterFunctionLists();
 
 private:
-    KeyframeAnimation(const CSSAnimationData* animation, RenderObject*, int index, CompositeAnimation*, RenderStyle* unanimatedStyle);
+    KeyframeAnimation(const CSSAnimationData*, RenderObject&, int index, CompositeAnimation*, RenderStyle& unanimatedStyle);
     virtual ~KeyframeAnimation();
 
     // Get the styles for the given property surrounding the current animation time and the progress between them.