CSSValue Immediates: Replace CSSPrimitiveValue usage with const references

Source/core/css/CSSBasicShapes.cpp

Index: Source/core/css/CSSBasicShapes.cpp
diff --git a/Source/core/css/CSSBasicShapes.cpp b/Source/core/css/CSSBasicShapes.cpp
index 8af835b6039e250a0593a722076f1d80a18c641a..562234c97b2d9c6c1fb7cacf26df72f3d7262617 100644
--- a/Source/core/css/CSSBasicShapes.cpp
+++ b/Source/core/css/CSSBasicShapes.cpp
@@ -69,13 +69,13 @@ static String buildCircleString(const String& radius, const String& centerX, con
 
 static String serializePositionOffset(const Pair& offset, const Pair& other)
 {
-    if ((toCSSPrimitiveValue(*offset.first()).getValueID() == CSSValueLeft && toCSSPrimitiveValue(*other.first()).getValueID() == CSSValueTop)
-        || (toCSSPrimitiveValue(*offset.first()).getValueID() == CSSValueTop && toCSSPrimitiveValue(*other.first()).getValueID() == CSSValueLeft))
-        return offset.second()->cssText();
+    if ((offset.first().getValueID() == CSSValueLeft && other.first().getValueID() == CSSValueTop)
+        || (offset.first().getValueID() == CSSValueTop && other.first().getValueID() == CSSValueLeft))
+        return offset.second().cssText();
     return offset.cssText();
 }
 
-static CSSPrimitiveValue buildSerializablePositionOffset(NullableCSSValue offset, CSSValueID defaultSide)
+static CSSPrimitiveValue buildSerializablePositionOffset(const NullableCSSValue& offset, CSSValueID defaultSide)
 {
     CSSValueID side = defaultSide;
     NullableCSSValue amount;
@@ -85,7 +85,7 @@ static CSSPrimitiveValue buildSerializablePositionOffset(NullableCSSValue offset
     } else if (toCSSPrimitiveValue(*offset).isValueID()) {
         side = toCSSPrimitiveValue(*offset).getValueID();
     } else if (Pair* pair = toCSSPrimitiveValue(*offset).getPairValue()) {
-        side = toCSSPrimitiveValue(*pair->first()).getValueID();
+        side = pair->first().getValueID();
         amount = pair->second();
     } else {
         amount = offset;
@@ -378,15 +378,14 @@ static String buildInsetString(const String& top, const String& right, const Str
     return result.toString();
 }
 
-static inline void updateCornerRadiusWidthAndHeight(NullableCSSValue corner, String& width, String& height)
+static inline void updateCornerRadiusWidthAndHeight(const NullableCSSValue& corner, String& width, String& height)
 {
     if (!corner)
         return;
 
     Pair* radius = toCSSPrimitiveValue(*corner).getPairValue();
-    width = radius->first() ? radius->first()->cssText() : String("0");
-    if (radius->second())
-        height = radius->second()->cssText();
+    width = radius->first().cssText();
+    height = radius->second().cssText();
 }
 
 String CSSBasicShapeInset::cssText() const