CSSValue Immediates: Replace CSSPrimitiveValue usage with const references

Source/core/css/CSSCalculationValue.cpp

Index: Source/core/css/CSSCalculationValue.cpp
diff --git a/Source/core/css/CSSCalculationValue.cpp b/Source/core/css/CSSCalculationValue.cpp
index 58eafddc048195b0d537bd18f33c5140b5b7ea12..cba354c13d7a9a1b554770eefbaa4934ce976f00 100644
--- a/Source/core/css/CSSCalculationValue.cpp
+++ b/Source/core/css/CSSCalculationValue.cpp
@@ -187,7 +187,7 @@ class CSSCalcPrimitiveValue final : public CSSCalcExpressionNode {
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(CSSCalcPrimitiveValue);
 public:
 
-    static PassRefPtrWillBeRawPtr<CSSCalcPrimitiveValue> create(CSSPrimitiveValue value, bool isInteger)
+    static PassRefPtrWillBeRawPtr<CSSCalcPrimitiveValue> create(const CSSPrimitiveValue& value, bool isInteger)
     {
         return adoptRefWillBeNoop(new CSSCalcPrimitiveValue(value, isInteger));
     }
@@ -281,7 +281,7 @@ public:
     }
 
 private:
-    CSSCalcPrimitiveValue(CSSPrimitiveValue value, bool isInteger)
+    CSSCalcPrimitiveValue(const CSSPrimitiveValue& value, bool isInteger)
         : CSSCalcExpressionNode(unitCategory(value.primitiveType()), isInteger)
         , m_value(value)
     {