CSSValue Immediates: Replace CSSPrimitiveValue usage with const references

Source/core/css/CSSPrimitiveValue.h

Index: Source/core/css/CSSPrimitiveValue.h
diff --git a/Source/core/css/CSSPrimitiveValue.h b/Source/core/css/CSSPrimitiveValue.h
index 30f7f6d940c0a77be6de96a4abd6ffc3c1acba49..c5a5bda5c172643b265b122eb2fc6e103581f7db 100644
--- a/Source/core/css/CSSPrimitiveValue.h
+++ b/Source/core/css/CSSPrimitiveValue.h
@@ -399,14 +399,26 @@ public:
     {
     }
 
-
+    /*
     CSSPrimitiveValue(const CSSPrimitiveValue& other)
         : m_rawValue(other.m_rawValue.asPtr)
     {
         ref();
+    }*/
+
+    CSSPrimitiveValue(CSSPrimitiveValue const& other)
+        : m_rawValue(other.m_rawValue.asPtr)
+    {
+        ref();
+    }
+
+    CSSPrimitiveValue(CSSPrimitiveValue&& other)
+        : m_rawValue(other.m_rawValue.asPtr)
+    {
+        other.m_rawValue.asPtr.clear();
     }
 
-    CSSPrimitiveValue& operator=(const CSSPrimitiveValue& rhs)
+    CSSPrimitiveValue& operator=(CSSPrimitiveValue const& rhs)
     {
         rhs.ref();
         deref();
@@ -414,9 +426,15 @@ public:
         return *this;
     }
 
+    CSSPrimitiveValue& operator=(CSSPrimitiveValue&& rhs)
+    {
+        return *this;
+    }
+
     ~CSSPrimitiveValue()
     {
-        deref();
+        if (m_rawValue.asPtr)
+            deref();
     }