CSSValue Immediates: Replace CSSPrimitiveValue usage with const references

Source/core/css/CSSGradientValue.h

Index: Source/core/css/CSSGradientValue.h
diff --git a/Source/core/css/CSSGradientValue.h b/Source/core/css/CSSGradientValue.h
index c3ee0f12edae071c59d9a7cccea91e81cc6a0d42..2969b4b46fab1a0174848bf2601790299b62f5af 100644
--- a/Source/core/css/CSSGradientValue.h
+++ b/Source/core/css/CSSGradientValue.h
@@ -85,10 +85,10 @@ class CSSGradientValue : public CSSImageGeneratorValue {
 public:
     PassRefPtr<Image> image(LayoutObject*, const IntSize&);
 
-    void setFirstX(NullableCSSValue val) { m_firstX = val; }
-    void setFirstY(NullableCSSValue val) { m_firstY = val; }
-    void setSecondX(NullableCSSValue val) { m_secondX = val; }
-    void setSecondY(NullableCSSValue val) { m_secondY = val; }
+    void setFirstX(NullableCSSValue val) { m_firstX = std::move(val); }
+    void setFirstY(NullableCSSValue val) { m_firstY = std::move(val); }
+    void setSecondX(NullableCSSValue val) { m_secondX = std::move(val); }
+    void setSecondY(NullableCSSValue val) { m_secondY = std::move(val); }
 
     void addStop(const CSSGradientColorStop& stop) { m_stops.append(stop); }
 
@@ -214,11 +214,11 @@ public:
     void setFirstRadius(CSSPrimitiveValue val) { m_firstRadius = val; }
     void setSecondRadius(CSSPrimitiveValue val) { m_secondRadius = val; }
 
-    void setShape(NullableCSSValue val) { m_shape = val; }
-    void setSizingBehavior(NullableCSSValue val) { m_sizingBehavior = val; }
+    void setShape(NullableCSSValue val) { m_shape = std::move(val); }
+    void setSizingBehavior(NullableCSSValue val) { m_sizingBehavior = std::move(val); }
 
-    void setEndHorizontalSize(NullableCSSValue val) { m_endHorizontalSize = val; }
-    void setEndVerticalSize(NullableCSSValue val) { m_endVerticalSize = val; }
+    void setEndHorizontalSize(NullableCSSValue val) { m_endHorizontalSize = std::move(val); }
+    void setEndVerticalSize(NullableCSSValue val) { m_endVerticalSize = std::move(val); }
 
     // Create the gradient for a given size.
     PassRefPtr<Gradient> createGradient(const CSSToLengthConversionData&, const IntSize&, const LayoutObject&);
@@ -246,7 +246,7 @@ private:
 
 
     // Resolve points/radii to front end values.
-    float resolveRadius(CSSPrimitiveValue, const CSSToLengthConversionData&, float* widthOrHeight = 0);
+    float resolveRadius(const CSSPrimitiveValue&, const CSSToLengthConversionData&, float* widthOrHeight = 0);
 
     // These may be null for non-deprecated gradients.
     NullableCSSValue m_firstRadius;