Oilpan: Unship Oilpan from CSSValues

Source/core/css/CSSUnsetValue.h

Index: Source/core/css/CSSUnsetValue.h
diff --git a/Source/core/css/CSSUnsetValue.h b/Source/core/css/CSSUnsetValue.h
index d9be3264a37fc91a2c45862c6888d76e80f7b5fe..45a64af2b90233bc3fe318b673864aac8d6c29d8 100644
--- a/Source/core/css/CSSUnsetValue.h
+++ b/Source/core/css/CSSUnsetValue.h
@@ -12,17 +12,15 @@ namespace blink {
 
 class CSSUnsetValue : public CSSValue {
 public:
-    static PassRefPtrWillBeRawPtr<CSSUnsetValue> create()
+    static PassRefPtr<CSSUnsetValue> create()
     {
-        return adoptRefWillBeNoop(new CSSUnsetValue);
+        return adoptRef(new CSSUnsetValue);
     }
 
     String customCSSText() const;
 
     bool equals(const CSSUnsetValue&) const { return true; }
 
-    DEFINE_INLINE_TRACE_AFTER_DISPATCH() { CSSValue::traceAfterDispatch(visitor); }
-
 private:
     CSSUnsetValue()
         : CSSValue(UnsetClass)