CSSValue Immediates: Replace CSSPrimitiveValue usage with const references

Source/core/css/resolver/ViewportStyleResolver.cpp

 /*
  * Copyright (C) 2012-2013 Intel Corporation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 119 matching lines @@
 float ViewportStyleResolver::viewportArgumentValue(CSSPropertyID id) const
 {
     float defaultValue = ViewportDescription::ValueAuto;
 
     // UserZoom default value is CSSValueZoom, which maps to true, meaning that
     // yes, it is user scalable. When the value is set to CSSValueFixed, we
     // return false.
     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();
 
     if (primitiveValue.isFontRelativeLength())
         return primitiveValue.getFloatValue() * m_document->computedStyle()->fontDescription().computedSize();
 
     if (primitiveValue.isPercentage()) {
         float percentValue = primitiveValue.getFloatValue() / 100.0f;
         switch (id) {
@@ skipping 25 matching lines @@
     }
 }
 
 Length ViewportStyleResolver::viewportLengthValue(CSSPropertyID id) const
 {
     ASSERT(id == CSSPropertyMaxHeight
         || id == CSSPropertyMinHeight
         || 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);
 
     ComputedStyle* documentStyle = m_document->mutableComputedStyle();
 
     // If we have viewport units the conversion will mark the document style as having viewport units.
     bool documentStyleHasViewportUnits = documentStyle->hasViewportUnits();
     documentStyle->setHasViewportUnits(false);
 
@@ skipping 15 matching lines @@
     return result;
 }
 
 DEFINE_TRACE(ViewportStyleResolver)
 {
     visitor->trace(m_propertySet);
     visitor->trace(m_document);
 }
 
 } // namespace blink