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

Source/core/css/CSSComputedStyleDeclaration.h

Index: Source/core/css/CSSComputedStyleDeclaration.h
diff --git a/Source/core/css/CSSComputedStyleDeclaration.h b/Source/core/css/CSSComputedStyleDeclaration.h
index c7bb727c3c1552e15591f894d4bf1df6ad5ff4d0..9a13fbe70350e16adc81ef611f00f7a1af4609bc 100644
--- a/Source/core/css/CSSComputedStyleDeclaration.h
+++ b/Source/core/css/CSSComputedStyleDeclaration.h
@@ -62,8 +62,8 @@ public:
 
     virtual PassRefPtrWillBeRawPtr<MutableStylePropertySet> copyProperties() const override;
 
-    PassRefPtrWillBeRawPtr<CSSValue> getPropertyCSSValue(CSSPropertyID) const;
-    PassRefPtrWillBeRawPtr<CSSValue> getFontSizeCSSValuePreferringKeyword() const;
+    NullableCSSValue getPropertyCSSValue(CSSPropertyID) const;
+    NullableCSSValue getFontSizeCSSValuePreferringKeyword() const;
     bool isMonospaceFont() const;
 
     PassRefPtrWillBeRawPtr<MutableStylePropertySet> copyPropertiesInSet(const Vector<CSSPropertyID>&) const;
@@ -93,11 +93,11 @@ private:
     virtual String removeProperty(const String& propertyName, ExceptionState&) override;
     virtual String cssText() const override;
     virtual void setCSSText(const String&, ExceptionState&) override;
-    virtual PassRefPtrWillBeRawPtr<CSSValue> getPropertyCSSValueInternal(CSSPropertyID) override;
+    virtual NullableCSSValue getPropertyCSSValueInternal(CSSPropertyID) override;
     virtual String getPropertyValueInternal(CSSPropertyID) override;
     virtual void setPropertyInternal(CSSPropertyID, const String& value, bool important, ExceptionState&) override;
 
-    virtual bool cssPropertyMatches(CSSPropertyID, const CSSValue*) const override;
+    virtual bool cssPropertyMatches(CSSPropertyID, const CSSValue) const override;
 
     RefPtrWillBeMember<Node> m_node;
     PseudoId m_pseudoElementSpecifier;