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

Source/core/animation/ImageStyleInterpolation.h

Index: Source/core/animation/ImageStyleInterpolation.h
diff --git a/Source/core/animation/ImageStyleInterpolation.h b/Source/core/animation/ImageStyleInterpolation.h
index cf799089540df6afcc37224046bdda084aaefa4e..414ca825f3c1271e00b03d70ad71800a0c870cb5 100644
--- a/Source/core/animation/ImageStyleInterpolation.h
+++ b/Source/core/animation/ImageStyleInterpolation.h
@@ -13,7 +13,7 @@ class ImageStyleInterpolation : public StyleInterpolation {
 public:
     static PassRefPtrWillBeRawPtr<ImageStyleInterpolation> create(CSSValue& start, CSSValue& end, CSSPropertyID id)
     {
-        return adoptRefWillBeNoop(new ImageStyleInterpolation(&start, &end, id));
+        return adoptRefWillBeNoop(new ImageStyleInterpolation(start, end, id));
     }
 
     DECLARE_VIRTUAL_TRACE();
@@ -22,15 +22,15 @@ public:
     virtual void apply(StyleResolverState&) const override;
 
 private:
-    ImageStyleInterpolation(PassRefPtrWillBeRawPtr<CSSValue> start, PassRefPtrWillBeRawPtr<CSSValue> end, CSSPropertyID id)
+    ImageStyleInterpolation(CSSValue start, CSSValue end, CSSPropertyID id)
         : StyleInterpolation(InterpolableNumber::create(0.0), InterpolableNumber::create(1.0), id)
         , m_initialImage(start)
         , m_finalImage(end)
     {
     }
 
-    RefPtrWillBeMember<CSSValue> m_initialImage;
-    RefPtrWillBeMember<CSSValue> m_finalImage;
+    CSSValue m_initialImage;
+    CSSValue m_finalImage;
 };
 }