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

Source/core/animation/DeferredLegacyStyleInterpolation.h

Index: Source/core/animation/DeferredLegacyStyleInterpolation.h
diff --git a/Source/core/animation/DeferredLegacyStyleInterpolation.h b/Source/core/animation/DeferredLegacyStyleInterpolation.h
index 993d03761436ef8d23142898a16b5b7fa546f27f..21fd7a85b6e83be6f6723cf386b8c3beb8c35039 100644
--- a/Source/core/animation/DeferredLegacyStyleInterpolation.h
+++ b/Source/core/animation/DeferredLegacyStyleInterpolation.h
@@ -21,7 +21,7 @@ class CSSValueList;
 
 class CORE_EXPORT DeferredLegacyStyleInterpolation : public StyleInterpolation {
 public:
-    static PassRefPtrWillBeRawPtr<DeferredLegacyStyleInterpolation> create(PassRefPtrWillBeRawPtr<CSSValue> start, PassRefPtrWillBeRawPtr<CSSValue> end, CSSPropertyID id)
+    static PassRefPtrWillBeRawPtr<DeferredLegacyStyleInterpolation> create(NullableCSSValue start, NullableCSSValue end, CSSPropertyID id)
     {
         return adoptRefWillBeNoop(new DeferredLegacyStyleInterpolation(start, end, id));
     }
@@ -43,7 +43,7 @@ public:
     virtual bool isDeferredLegacyStyleInterpolation() const override final { return true; }
 
 private:
-    DeferredLegacyStyleInterpolation(PassRefPtrWillBeRawPtr<CSSValue> start, PassRefPtrWillBeRawPtr<CSSValue> end, CSSPropertyID id)
+    DeferredLegacyStyleInterpolation(NullableCSSValue start, NullableCSSValue end, CSSPropertyID id)
         : StyleInterpolation(InterpolableNumber::create(0), InterpolableNumber::create(1), id)
         , m_startCSSValue(start)
         , m_endCSSValue(end)
@@ -51,8 +51,8 @@ private:
     {
     }
 
-    RefPtrWillBeMember<CSSValue> m_startCSSValue;
-    RefPtrWillBeMember<CSSValue> m_endCSSValue;
+    NullableCSSValue m_startCSSValue;
+    NullableCSSValue m_endCSSValue;
     mutable RefPtrWillBeMember<LegacyStyleInterpolation> m_innerInterpolation;
     mutable bool m_outdated;
 };