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

Source/modules/canvas2d/CanvasRenderingContext2DState.h

Index: Source/modules/canvas2d/CanvasRenderingContext2DState.h
diff --git a/Source/modules/canvas2d/CanvasRenderingContext2DState.h b/Source/modules/canvas2d/CanvasRenderingContext2DState.h
index 2195fc08098b0de3b6f4b9b019b9dcbf0d4d7ad6..75401f42c01c9f180642c0f9d6771a57b02e68d6 100644
--- a/Source/modules/canvas2d/CanvasRenderingContext2DState.h
+++ b/Source/modules/canvas2d/CanvasRenderingContext2DState.h
@@ -6,6 +6,7 @@
 #define CanvasRenderingContext2DState_h
 
 #include "core/css/CSSFontSelectorClient.h"
+#include "core/css/CSSValue.h"
 #include "modules/canvas2d/ClipList.h"
 #include "platform/fonts/Font.h"
 #include "platform/transforms/AffineTransform.h"
@@ -14,7 +15,6 @@
 namespace blink {
 
 class CanvasStyle;
-class CSSValue;
 class Element;
 
 class CanvasRenderingContext2DState final : public NoBaseWillBeGarbageCollectedFinalized<CanvasRenderingContext2DState>, public CSSFontSelectorClient {
@@ -80,7 +80,7 @@ public:
     void setUnparsedFont(const String& font) { m_unparsedFont = font; }
     const String& unparsedFont() const { return m_unparsedFont; }
 
-    void setFilter(PassRefPtrWillBeRawPtr<CSSValue>);
+    void setFilter(CSSValue);
     void setUnparsedFilter(const String& filterString) { m_unparsedFilter = filterString; }
     const String& unparsedFilter() const { return m_unparsedFilter; }
     SkImageFilter* getFilter(Element*, const Font&) const;
@@ -200,7 +200,7 @@ private:
     Font m_font;
 
     String m_unparsedFilter;
-    RefPtrWillBeMember<CSSValue> m_filterValue;
+    NullableCSSValue m_filterValue;
     mutable RefPtr<SkImageFilter> m_resolvedFilter;
 
     // Text state.