CSSValue Immediates: Replace CSSPrimitiveValue usage with const references

Source/core/css/Rect.h

Index: Source/core/css/Rect.h
diff --git a/Source/core/css/Rect.h b/Source/core/css/Rect.h
index 2ce8b26ae89ae020a4f15c9520625d282f4eb332..0bae3ab185a74e04b2caa3f7645df07fd0a908ec 100644
--- a/Source/core/css/Rect.h
+++ b/Source/core/css/Rect.h
@@ -31,15 +31,15 @@ namespace blink {
 class CORE_EXPORT RectBase : public RefCountedWillBeGarbageCollectedFinalized<RectBase> {
     DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(RectBase);
 public:
-    CSSPrimitiveValue top() const { return toCSSPrimitiveValue(*m_top); }
-    CSSPrimitiveValue right() const { return toCSSPrimitiveValue(*m_right); }
-    CSSPrimitiveValue bottom() const { return toCSSPrimitiveValue(*m_bottom); }
-    CSSPrimitiveValue left() const { return toCSSPrimitiveValue(*m_left); }
-
-    void setTop(CSSPrimitiveValue top) { m_top = top; }
-    void setRight(CSSPrimitiveValue right) { m_right = right; }
-    void setBottom(CSSPrimitiveValue bottom) { m_bottom = bottom; }
-    void setLeft(CSSPrimitiveValue left) { m_left = left; }
+    const CSSPrimitiveValue& top() const { return toCSSPrimitiveValue(*m_top); }
+    const CSSPrimitiveValue& right() const { return toCSSPrimitiveValue(*m_right); }
+    const CSSPrimitiveValue& bottom() const { return toCSSPrimitiveValue(*m_bottom); }
+    const CSSPrimitiveValue& left() const { return toCSSPrimitiveValue(*m_left); }
+
+    void setTop(const CSSPrimitiveValue& top) { m_top = top; }
+    void setRight(const CSSPrimitiveValue& right) { m_right = right; }
+    void setBottom(const CSSPrimitiveValue& bottom) { m_bottom = bottom; }
+    void setLeft(const CSSPrimitiveValue& left) { m_left = left; }
 
     bool equals(const RectBase& other) const
     {