Pass RenderStyle / RenderObject by reference in more places

Source/core/css/resolver/StyleResolver.h

Index: Source/core/css/resolver/StyleResolver.h
diff --git a/Source/core/css/resolver/StyleResolver.h b/Source/core/css/resolver/StyleResolver.h
index d61bfb89081c44fa89df864043bee85b04e3f487..327cc04bc18c6d6797d6870e98226e988f6c1274 100644
--- a/Source/core/css/resolver/StyleResolver.h
+++ b/Source/core/css/resolver/StyleResolver.h
@@ -192,10 +192,10 @@ public:
         RuleMatchingBehavior = MatchAllRules, RenderRegion* regionForStyling = 0);
 
     // FIXME: The following logic related to animations and keyframes should be factored out of StyleResolver
-    void resolveKeyframes(Element*, const RenderStyle*, const AtomicString& animationName, TimingFunction* defaultTimingFunction, Vector<std::pair<KeyframeAnimationEffect::KeyframeVector, RefPtr<TimingFunction> > >&);
-    void keyframeStylesForAnimation(Element*, const RenderStyle*, KeyframeList&);
+    void resolveKeyframes(Element*, const RenderStyle&, const AtomicString& animationName, TimingFunction* defaultTimingFunction, Vector<std::pair<KeyframeAnimationEffect::KeyframeVector, RefPtr<TimingFunction> > >&);
+    void keyframeStylesForAnimation(Element*, const RenderStyle&, KeyframeList&);
     const StyleRuleKeyframes* matchScopedKeyframesRule(const Element*, const StringImpl* animationName);
-    PassRefPtr<RenderStyle> styleForKeyframe(Element*, const RenderStyle*, const StyleKeyframe*);
+    PassRefPtr<RenderStyle> styleForKeyframe(Element*, const RenderStyle&, const StyleKeyframe*);
 
     PassRefPtr<RenderStyle> pseudoStyleForElement(Element*, const PseudoStyleRequest&, RenderStyle* parentStyle);