CSSValue Immediates: Change CSSValue to an object instead of a pointer

Source/core/animation/LengthBoxStyleInterpolation.h

Index: Source/core/animation/LengthBoxStyleInterpolation.h
diff --git a/Source/core/animation/LengthBoxStyleInterpolation.h b/Source/core/animation/LengthBoxStyleInterpolation.h
index 2057fb945b0f5a629b8ca1efcfa58cd32d82f78a..c7dd881c4eb982171c08388dfbc360932f401b77 100644
--- a/Source/core/animation/LengthBoxStyleInterpolation.h
+++ b/Source/core/animation/LengthBoxStyleInterpolation.h
@@ -22,17 +22,17 @@ public:
     DECLARE_VIRTUAL_TRACE();
 
 private:
-    LengthBoxStyleInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> startInterpolation, PassOwnPtrWillBeRawPtr<InterpolableValue> endInterpolation, CSSPropertyID id, CSSValue* startCSS, CSSValue* endCSS)
+    LengthBoxStyleInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> startInterpolation, PassOwnPtrWillBeRawPtr<InterpolableValue> endInterpolation, CSSPropertyID id, CSSValue startCSS, CSSValue endCSS)
         : StyleInterpolation(startInterpolation, endInterpolation, id)
         , m_startCSSValue(startCSS)
         , m_endCSSValue(endCSS)
     { }
 
     static PassOwnPtrWillBeRawPtr<InterpolableValue> lengthBoxtoInterpolableValue(const CSSValue&, const CSSValue&, bool);
-    static PassRefPtrWillBeRawPtr<CSSValue> interpolableValueToLengthBox(InterpolableValue*, const CSSValue&, const CSSValue&);
+    static CSSValue interpolableValueToLengthBox(InterpolableValue*, const CSSValue&, const CSSValue&);
 
-    RefPtrWillBeMember<CSSValue> m_startCSSValue;
-    RefPtrWillBeMember<CSSValue> m_endCSSValue;
+    CSSValue m_startCSSValue;
+    CSSValue m_endCSSValue;
 
     friend class AnimationLengthBoxStyleInterpolationTest;
 };