CSSValue Immediates: Replace CSSPrimitiveValue usage with const references

Source/core/css/CSSReflectValue.h

Index: Source/core/css/CSSReflectValue.h
diff --git a/Source/core/css/CSSReflectValue.h b/Source/core/css/CSSReflectValue.h
index 6dd80ebea70c7955ae1451214301449caf1458a2..5e68147086ec51062530ebf99359f5fb2b0da454 100644
--- a/Source/core/css/CSSReflectValue.h
+++ b/Source/core/css/CSSReflectValue.h
@@ -36,15 +36,15 @@ class CSSPrimitiveValue;
 
 class CSSReflectValue : public CSSValueObject {
 public:
-    static PassRefPtrWillBeRawPtr<CSSReflectValue> create(CSSPrimitiveValue direction,
-        CSSPrimitiveValue offset, NullableCSSValue mask)
+    static PassRefPtrWillBeRawPtr<CSSReflectValue> create(const CSSPrimitiveValue& direction,
+        const CSSPrimitiveValue& offset, const NullableCSSValue& mask)
     {
         return adoptRefWillBeNoop(new CSSReflectValue(direction, offset, mask));
     }
 
-    CSSPrimitiveValue direction() const { return toCSSPrimitiveValue(m_direction); }
-    CSSPrimitiveValue offset() const { return toCSSPrimitiveValue(m_offset); }
-    NullableCSSValue mask() const { return m_mask; }
+    const CSSPrimitiveValue& direction() const { return toCSSPrimitiveValue(m_direction); }
+    const CSSPrimitiveValue& offset() const { return toCSSPrimitiveValue(m_offset); }
+    const NullableCSSValue& mask() const { return m_mask; }
 
     String customCSSText() const;
 
@@ -53,7 +53,7 @@ public:
     DECLARE_TRACE_AFTER_DISPATCH();
 
 private:
-    CSSReflectValue(CSSPrimitiveValue direction, CSSPrimitiveValue offset, NullableCSSValue mask)
+    CSSReflectValue(const CSSPrimitiveValue& direction, const CSSPrimitiveValue& offset, const NullableCSSValue& mask)
         : CSSValueObject(ReflectClass)
         , m_direction(direction)
         , m_offset(offset)