CSSValue Immediates: Replace CSSPrimitiveValue usage with const references

Source/core/css/resolver/ViewportStyleResolver.cpp

Index: Source/core/css/resolver/ViewportStyleResolver.cpp
diff --git a/Source/core/css/resolver/ViewportStyleResolver.cpp b/Source/core/css/resolver/ViewportStyleResolver.cpp
index 28035aa9a8f429ae7b90ba7a366200905b288637..fbfbc91fce7d4061e79872559c9430e0c77702d4 100644
--- a/Source/core/css/resolver/ViewportStyleResolver.cpp
+++ b/Source/core/css/resolver/ViewportStyleResolver.cpp
@@ -137,11 +137,11 @@ float ViewportStyleResolver::viewportArgumentValue(CSSPropertyID id) const
     if (id == CSSPropertyUserZoom)
         defaultValue = 1;
 
-    NullableCSSValue value = m_propertySet->getPropertyCSSValue(id);
+    const NullableCSSValue& value = m_propertySet->getPropertyCSSValue(id);
     if (!value || !value->isPrimitiveValue())
         return defaultValue;
 
-    CSSPrimitiveValue primitiveValue = toCSSPrimitiveValue(*value);
+    const CSSPrimitiveValue& primitiveValue = toCSSPrimitiveValue(value);
 
     if (primitiveValue.isNumber() || primitiveValue.isPx())
         return primitiveValue.getFloatValue();
@@ -187,11 +187,11 @@ Length ViewportStyleResolver::viewportLengthValue(CSSPropertyID id) const
         || id == CSSPropertyMaxWidth
         || id == CSSPropertyMinWidth);
 
-    NullableCSSValue value = m_propertySet->getPropertyCSSValue(id);
+    const NullableCSSValue& value = m_propertySet->getPropertyCSSValue(id);
     if (!value || !value->isPrimitiveValue())
         return Length(); // auto
 
-    CSSPrimitiveValue primitiveValue = toCSSPrimitiveValue(*value);
+    const CSSPrimitiveValue& primitiveValue = toCSSPrimitiveValue(value);
 
     if (primitiveValue.getValueID() == CSSValueInternalExtendToZoom)
         return Length(ExtendToZoom);