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

Source/core/css/ComputedStyleCSSValueMapping.h

Index: Source/core/css/ComputedStyleCSSValueMapping.h
diff --git a/Source/core/css/ComputedStyleCSSValueMapping.h b/Source/core/css/ComputedStyleCSSValueMapping.h
index 76764c17212b5558688ae3c2257b97e7ed2de3f2..5c392a46dddb513b62122445f55a37e5ee711a16 100644
--- a/Source/core/css/ComputedStyleCSSValueMapping.h
+++ b/Source/core/css/ComputedStyleCSSValueMapping.h
@@ -21,13 +21,13 @@ class Node;
 class ComputedStyleCSSValueMapping {
 public:
     // FIXME: Resolve computed auto alignment in applyProperty/ComputedStyle and remove this non-const styledNode parameter.
-    static PassRefPtrWillBeRawPtr<CSSValue> get(CSSPropertyID, const ComputedStyle&, const LayoutObject* = nullptr, Node* styledNode = nullptr, bool allowVisitedStyle = false);
+    static NullableCSSValue get(CSSPropertyID, const ComputedStyle&, const LayoutObject* = nullptr, Node* styledNode = nullptr, bool allowVisitedStyle = false);
 private:
     static PassRefPtrWillBeRawPtr<CSSPrimitiveValue> currentColorOrValidColor(const ComputedStyle&, const StyleColor&);
-    static PassRefPtrWillBeRawPtr<CSSValue> valueForShadowData(const ShadowData&, const ComputedStyle&, bool useSpread);
-    static PassRefPtrWillBeRawPtr<CSSValue> valueForShadowList(const ShadowList*, const ComputedStyle&, bool useSpread);
-    static PassRefPtrWillBeRawPtr<CSSValue> valueForFilter(const ComputedStyle&);
-    static PassRefPtrWillBeRawPtr<CSSValue> valueForFont(const ComputedStyle&);
+    static CSSValue valueForShadowData(const ShadowData&, const ComputedStyle&, bool useSpread);
+    static CSSValue valueForShadowList(const ShadowList*, const ComputedStyle&, bool useSpread);
+    static CSSValue valueForFilter(const ComputedStyle&);
+    static CSSValue valueForFont(const ComputedStyle&);
 };
 
 } // namespace blink