CSSValue Immediates: Make CSSPrimitiveValue a container

Source/core/animation/LengthStyleInterpolation.cpp

Index: Source/core/animation/LengthStyleInterpolation.cpp
diff --git a/Source/core/animation/LengthStyleInterpolation.cpp b/Source/core/animation/LengthStyleInterpolation.cpp
index bd52ac3755aa514408b1e2272ff98bdf15cc9c8a..bc973808d28a07be77bf0178592ba2783e16f889 100644
--- a/Source/core/animation/LengthStyleInterpolation.cpp
+++ b/Source/core/animation/LengthStyleInterpolation.cpp
@@ -54,7 +54,7 @@ bool pixelsForKeyword(CSSPropertyID property, CSSValueID valueID, double& result
 bool LengthStyleInterpolation::canCreateFrom(const CSSValue value, CSSPropertyID property)
 {
     if (value.isPrimitiveValue()) {
-        const CSSPrimitiveValue& primitiveValue = toCSSPrimitiveValue(value);
+        const CSSPrimitiveValue primitiveValue = toCSSPrimitiveValue(value);
         if (primitiveValue.cssCalcValue())
             return true;
 
@@ -78,7 +78,7 @@ PassOwnPtrWillBeRawPtr<InterpolableValue> LengthStyleInterpolation::toInterpolab
     OwnPtrWillBeRawPtr<InterpolableList> listOfValues = InterpolableList::create(CSSPrimitiveValue::LengthUnitTypeCount);
     OwnPtrWillBeRawPtr<InterpolableList> listOfTypes = InterpolableList::create(CSSPrimitiveValue::LengthUnitTypeCount);
 
-    const CSSPrimitiveValue& primitive = toCSSPrimitiveValue(value);
+    const CSSPrimitiveValue primitive = toCSSPrimitiveValue(value);
 
     CSSLengthArray arrayOfValues;
     CSSPrimitiveValue::CSSLengthTypeArray arrayOfTypes;
@@ -278,7 +278,7 @@ static Length lengthFromInterpolableValue(const InterpolableValue& value, Interp
 
 }
 
-PassRefPtrWillBeRawPtr<CSSPrimitiveValue> LengthStyleInterpolation::fromInterpolableValue(const InterpolableValue& value, InterpolationRange range)
+CSSPrimitiveValue LengthStyleInterpolation::fromInterpolableValue(const InterpolableValue& value, InterpolationRange range)
 {
     const InterpolableList* listOfValuesAndTypes = toInterpolableList(&value);
     const InterpolableList* listOfValues = toInterpolableList(listOfValuesAndTypes->get(0));